AFAIK,
machinists charge a considerable amount for any work done regardless of how simple the task ... I think that there may be a 1 hour minimum charge UNLESS you know someone ...
I presume that your current BB spindle has square tapers & the crank is secured with nuts -- THAT was the "cheaper" alternative to both the hollow-and-solid spindles which 'I' presume was to expedite assembly line production ([COLOR= #808080]
i.e., to save a minute per bike + $1.00 in the difference between the cost of 2 nuts + washers vs. 2 'special' bolts + washers[/COLOR]) ...
FYI. Hollow square taper spindles were made by both Shimano (JIS) & Campagnolo (ISO) ...
If your tapers are symmetrical, then if you cannot find a separate spindle (which will probably be 113mm OR 118mm, the former is asymmetrical ... I'm not sure about 118mm spindles ... 115mm are symmetrical ... I'm not sure about YOUR 116mm spindle) ...
- AND, if you plan to continue to use your current crankset ...
Then, you should consider replacing the current BB with a Shimano (or, other brand) CARTRIDGE Bottom Bracket ...
- the more expensive the Shimano cartridge BB, the lighter ... with Dura Ace & XTR being the lightest ([COLOR= #808080]but, due to the metal sleeve/etc. they still tend to be a little on the porky side when compared to a separate spindle & bearings & cups[/COLOR]) ...
But, IMO, a better option may be to bite-the-bullet & buy either a
Shimano Hollowtech II or an
FSA MegaExo crankset + BB cups (the two brands are interchangeable ... ([COLOR= #808080]some people have found that the FSA bearings do not last as long as Shimano's[/COLOR]) ...
BTW. I'm still a big fan of Shimano's
now-obsolete Octalink BBs & Cranksets ...
I'm also a fan of Campagnolo's Record-and-Chorus square taper BBs ([COLOR= #0000ff]102mm[/COLOR]) & Cranksets ...
- I am still trying to embrace the external bearing ([COLOR= #0000cd]e.g., Hollowtech II, MegaExo, Ultra Torque & Power Torque[/COLOR]) Bottom Brackets & Cranks ...
- I guess THAT may mean that some of my bikes and I have been trapped in a time warp!?!