Fixing a burr inside my seat tube

[David Johnson]

Was trying to find a seat post from my junk pile to fit my
Santana Tandem, because my daughter doesn't like my wife's
Terry seat. Found one without a size marked that went in the
seat tube without much effort, but when I tried to pull it
out, it refused. I finally got it out with a lot of lube and
effort, but now the original doesn't want to go in more than
a few inches, and by the scratches on the seat post, it's
obvious that there is a burr or something inside the seat
tube just past the reach of my fingers. How do I get rid of
this without damaging my frame?

I've thought of an automobile brake cylinder hone if it will
fit. For the non-auto mechanics, that is 3 fine abrasive
stones on spring-loaded arms that is attached to a drill.

[Werehatrack]

On Sun, 11 Jul 2004 12:13:56 -0400, David Johnson
<djohnson+news@mnjazz.com> wrote:

>... but now the original doesn't want to go in more than a
>few inches, and by the scratches on the seat post, it's
>obvious that there is a burr or something inside the seat
>tube just past the reach of my fingers. How do I get rid of
>this without damaging my frame?
>
>I've thought of an automobile brake cylinder hone if it
>will fit. For the non-auto mechanics, that is 3 fine
>abrasive stones on spring-loaded arms that is attached
>to a drill.

A three-stone brake hone will probably fit unless the seat
tube is under 25mm ID. If that's the case, use a two-stone
hone instead; they'll compress to fit a 17mm cylinder.

Before you get too carried away, take a peek down into the
tube with a small flashlight. It may be that your offender
is a piece of loose (but sharp) junk that can be swabbed out
with a rag on the end of some coathanger wire. If the seat
tube is aluminum, soak the rag in ammonia to get the oxides
out of the tube while you're at it.

--
Typoes are a feature, not a bug. Some gardening required to
reply via email. Surrealism is a pectinated ranzel.

[David Johnson]

On Sun, 11 Jul 2004 17:58:26 +0000, Werehatrack wrote:

>
> Before you get too carried away, take a peek down into the
> tube with a small flashlight. It may be that your offender
> is a piece of loose (but sharp) junk that can be swabbed
> out with a rag on the end of some coathanger wire. If the
> seat tube is aluminum, soak the rag in ammonia to get the
> oxides out of the tube while you're at it.

I've swabbed the seat tube out with a chunk of towel and a
stick, that didn't help. Frame is steel. I've tried to look
inside with a flashlight and haven't seen anything obvious,
I'll try again before I get the hone.

[David Johnson]

On Sun, 11 Jul 2004 17:58:26 +0000, Werehatrack wrote:

> A three-stone brake hone will probably fit unless the seat
> tube is under 25mm ID. If that's the case, use a two-stone
> hone instead; they'll compress to fit a 17mm cylinder.
>
AutoZone had both 2 and 3 that would fit my seat tube, the 2
was cheaper, and I'm cheap, so...

> Before you get too carried away, take a peek down into the
> tube with a small flashlight. It may be that your offender
> is a piece of loose (but sharp) junk that can be swabbed
> out with a rag on the end of some coathanger wire. If the
> seat tube is aluminum, soak the rag in ammonia to get the
> oxides out of the tube while you're at it.

It probably was a chunk of something wedged in by the steel
seat tube I was checking out, but I couldn't see it with a
flashlight, and the rag didn't take care of it. The hone
took care of it. In fact, it took longer to take the hone
out of it's blister pack than it took to hone my seat tube
back into working order. About 15 seconds with the hone.

[Werehatrack]

On Sun, 11 Jul 2004 18:37:31 -0400, David Johnson
<djohnson+news@mnjazz.com> wrote:

>It probably was a chunk of something wedged in by the steel
>seat tube I was checking out, but I couldn't see it with a
>flashlight, and the rag didn't take care of it. The hone
>took care of it. In fact, it took longer to take the hone
>out of it's blister pack than it took to hone my seat tube
>back into working order. About 15 seconds with the hone.

It worked; that's what matters. It can be amazing how much
of a difference knocking off a visually imperceptible
obstruction can make in the fit of telescoping tubing.
--
Typoes are a feature, not a bug. Some gardening required to
reply via email. Surrealism is a pectinated ranzel.