Suntour barcon locknut

[David Griffith]

See:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=220030240756&ssPageName=STRK:MEWA:IT&ih=012

The seller notes that one of the shifters is missing a locknut.

So is one of mine.

Does anyone know where might I find one?

 

[Nigel Cliffe]

David Griffith wrote:
> See:
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=220030240756&ssPageName=STRK:MEWA:IT&ih=012
>
> The seller notes that one of the shifters is missing a locknut.
>
> So is one of mine.
>
> Does anyone know where might I find one?

Looks like a very ordinary hexagonal nut. I'd guess the thread to be a
standard metric one.

So, first determine the thread size (measure the outside diameter of the
thread and round up to the nearest), guess the pitch (unless you have means
to measure), and decide what nut to buy.

If you're lucky it fits in one. You may have to thin it down a little (easy
job with a file).

If really stuck (ie. cannot find a standard nut which fits), find someone
who is a model engineer (makes working steam engines and the like) and ask
them to make a nut for you; its pretty easy if you have the relevant taps
and a decent file.



- Nigel


--
Nigel Cliffe,
Webmaster at http://www.2mm.org.uk/

 

[David Griffith]

Nigel Cliffe wrote:
> David Griffith wrote:
>> See:
>>
>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=220030240756&ssPageName=STRK:MEWA:IT&ih=012
>>
>> The seller notes that one of the shifters is missing a locknut.
>>
>> So is one of mine.
>>
>> Does anyone know where might I find one?
>
> Looks like a very ordinary hexagonal nut. I'd guess the thread to be a
> standard metric one.
>
> So, first determine the thread size (measure the outside diameter of the
> thread and round up to the nearest), guess the pitch (unless you have means
> to measure), and decide what nut to buy.
>
> If you're lucky it fits in one. You may have to thin it down a little (easy
> job with a file).
>
> If really stuck (ie. cannot find a standard nut which fits), find someone
> who is a model engineer (makes working steam engines and the like) and ask
> them to make a nut for you; its pretty easy if you have the relevant taps
> and a decent file.
>
>
>
> - Nigel
>
>
The nut I need is not the hexagonal one. It's a round nut with a flat
screwdriver slot and a tiny hex socket.

Take a close look at the lower left picture. The right barcon has the
locknut.

dcg

 

[Nigel Cliffe]

David Griffith wrote:
> Nigel Cliffe wrote:
>> David Griffith wrote:
>>> See:
>>>
>>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=220030240756&ssPageName=STRK:MEWA:IT&ih=012
>>>
>>> The seller notes that one of the shifters is missing a locknut.
>>>
>>> So is one of mine.
>>>
>>> Does anyone know where might I find one?
>>
>> Looks like a very ordinary hexagonal nut. I'd guess the thread to
>> be a standard metric one.

> The nut I need is not the hexagonal one. It's a round nut with a flat
> screwdriver slot and a tiny hex socket.

Sorry my mistake. I thought the right had a hole.

> Take a close look at the lower left picture. The right barcon has the
> locknut.

Does the hex-socket achieve anything which cannot be done with a screwdriver
?

If it does, then I'd know how to make one, but it would take quite a while
(I'd start by silver-soldering a bit of hex tube into a hole to make the hex
bit).

If the hex socket is only an alternative to a screwdriver, then I'd make a
disc, cut a screwdriver slot in it (hacksaw if no other method available),
then drill & tap for the required thread.


- Nigel


--
Nigel Cliffe,
Webmaster at http://www.2mm.org.uk/

 

[Donald Gillies]

First of all, try this guy :

[email protected], 2/15/2005
Warren Koebler
193 Melrose Ave.
Needham, MA. 02492

If he doesn't have any, you can make something similar with a drill
and file. Find 2 appropriately-sized metric nuts and a bolt at your
hardware store. Mount both nuts onto the bolt, tightening them
against each other until they are firmly attached.

mount the bolt into a drill. Turn on the drill ( your mini-lathe ) at
high speed and with a file - USE GOGGLES OR GO BLIND - and file down
the top nut until is no longer hexagonal - until it is circular. You
can then use a hacksaw or a fine file to cut a slot in the top.

A simpler solution is to simply get a smaller hex nut and cut the slot
in the top with a hacksaw. Then, either mount the nut with needlenose
pliers (not reliable - hard to get it tight enough), or file away the
middle of a screwdriver and use the special screwdriver to mount the
nut. The screwdriver will still be semi-usable after this operation.

Good Luck,

- Don Gillies
San Diego, CA

 

[Donald Gillies]

"Nigel Cliffe" <[email protected]> writes:

>> The nut I need is not the hexagonal one. It's a round nut with a flat
>> screwdriver slot - CORRECT - and a tiny hex socket - INCORRECT !!!

What you need are TWO nuts :

1. A regular hex nut, regular metric sized.
2. A circular locknut which is slotted on top.

In a pinch, 2 regular hex nuts can be made to work by filing a slot in
the top of the 2nd hex nut. There never was any such thing as a
"combined" nut - if you apart a barcon you will see that 2 threaded
nuts are involved. You have to have 2 nuts in order to get a locking
action on the Barcon bolt.

- Don Gillies
San Diego, CA

 

[David Griffith]

Donald Gillies wrote:
> First of all, try this guy :
>
> [email protected], 2/15/2005
> Warren Koebler
> 193 Melrose Ave.
> Needham, MA. 02492
>
> If he doesn't have any, you can make something similar with a drill
> and file. Find 2 appropriately-sized metric nuts and a bolt at your
> hardware store. Mount both nuts onto the bolt, tightening them
> against each other until they are firmly attached.
>
> mount the bolt into a drill. Turn on the drill ( your mini-lathe ) at
> high speed and with a file - USE GOGGLES OR GO BLIND - and file down
> the top nut until is no longer hexagonal - until it is circular. You
> can then use a hacksaw or a fine file to cut a slot in the top.
>
> A simpler solution is to simply get a smaller hex nut and cut the slot
> in the top with a hacksaw. Then, either mount the nut with needlenose
> pliers (not reliable - hard to get it tight enough), or file away the
> middle of a screwdriver and use the special screwdriver to mount the
> nut. The screwdriver will still be semi-usable after this operation.
>
> Good Luck,
>
> - Don Gillies
> San Diego, CA

Thanks for the good advice. Another nut with a slot cut in it would
work, but wouldn't be as attractive.

David Griffith

 

[carpediemracing]

heh semi-seriously... I have to go home and see if I actually have a set. I had maybe 5 sets but I think I threw out all the left shifters.

if I have a set, and if you're willing to pay $7 (US) for shipping, I'll send you a set. if you want a set of indexed ones I'll include those as well (they have a semi-friction mode). I think $7 will make me about $3 profit if I send USPS and you're in the US somewhere.

if I'm not allowed to post any sort of post like this (i.e. things for sale) let me know and I'll edit it out.

a tip - go to an old shop with lots of old drawers holding parts. they may have these things laying around in some dusty drawer.

cdr

 

[Tom Ace]

If you want to tap threads yourself,
or if you want to hunt for a substitute nut,
the thread for the SunTour barcon locknut
is M4 x 0.7 .

Campagnolo barcons used a hex locknut
(M5 x 0.8) but they had a recess with a
diameter large enough to let you get an
8mm socket wrench in. (The hex locknut
arrangement isn't as clean looking as the
SunTour round slotted one, in my opinion.)

Tom Ace

 

[David Griffith]

carpediemracing wrote:
> heh semi-seriously... I have to go home and see if I actually have a
> set. I had maybe 5 sets but I think I threw out all the left shifters.
>
> if I have a set, and if you're willing to pay $7 (US) for shipping,
> I'll send you a set. if you want a set of indexed ones I'll include
> those as well (they have a semi-friction mode). I think $7 will make
> me about $3 profit if I send USPS and you're in the US somewhere.
>
> if I'm not allowed to post any sort of post like this (i.e. things for
> sale) let me know and I'll edit it out.
>
> a tip - go to an old shop with lots of old drawers holding parts.
> they may have these things laying around in some dusty drawer.
>
> cdr
>
>

Thanks! I'd gladly pay $7 for shipping.

dcg

 

[David Griffith]

carpediemracing wrote:
> heh semi-seriously... I have to go home and see if I actually have a
> set. I had maybe 5 sets but I think I threw out all the left shifters.
>
> if I have a set, and if you're willing to pay $7 (US) for shipping,
> I'll send you a set. if you want a set of indexed ones I'll include
> those as well (they have a semi-friction mode). I think $7 will make
> me about $3 profit if I send USPS and you're in the US somewhere.
>
> if I'm not allowed to post any sort of post like this (i.e. things for
> sale) let me know and I'll edit it out.
>
> a tip - go to an old shop with lots of old drawers holding parts.
> they may have these things laying around in some dusty drawer.
>
> cdr
>
>
That's a very generous offer I would gladly accept. You can email me at
[email protected].

Hope you find them!

David Griffith
(in Florida)