my round square taper!

[HeyYou]

I've found an early Shimano square taper crank set from 1979, so obviously quite special and 'hard to find'.

 

Trouble is the square taper on the non-drive side is a little 'buggered', it's obviously been ridden while a bit loose and the square bit is now a roundish bit!

 

I've thought of inserting a bb axle and stuffing the 'holes' with plastic steel, but there may be a better way.

 

Anyone have any ideas?

Can someone with a machine shop 'reuild' the inside of the square taper?

 

I'd appreciate any ideas.

[quintonb]

Plastic steel or any kind of epoxy wouldn't work. Too much load gets put onto pedals which is then transfered through the crank arm onto the small bb spindle. You could try and get someone who knows what they doing to aluminium weld the taper and then rebroach the square taper. Tricky job so the guys would have to know what they doing. Other option is to machine the old square area out and insert it,the Square taper would then be broached into the insert. Once again not something I would give to just anyone. And absolute success is never a guarantee. First prize would be trying to find a good left side crank arm and use that. Good luck.