optimator

....We have a Campy crank with the threads where you would screw in the crank arm puller ruined. I've been into bikes for years but I don't recall ever seeing a tool to recut those threads. Can it be done? Thanks - Carl

MrCjolsen

I think your crank is toast. Your goal now is to remove the crank and the BB without damaging the frame.

When it happened to me, I was able to unscrew the BB threads on one side. If it's a cup and cone BB, you should be able to do that.

Of course, if you're talking about a crank that is already off the bike, then perhaps you might be able to use it as a meat tenerizer.

Grand Bois

How hard did you try to find that tool?
https://www.biketoolsetc.com/index.cg..._id=VR-PE11000

cny-bikeman

Well, unless he can locate a shop with that tool it would be foolish to spend more on the tool than on a new crankset. I know that there once existed a tool that would cut new threads if there was enough metal left but don't know if it still exists. I'll have a look. A car mechanic may be able to rig a pulley remover to pull off the crank.

cny-bikeman

Here is the thread chasing tool. Note that this will only repair minor damage. If someone has actually pulled the threads out by not engaging the tool completely this will likely not help. https://www.bicycleresearchtools.com/...l#anchor350490

DMF 

Or this set (here too) to re-cut the threads on the bike and use them to pull the arm off?

pigiron

hacksaw: https://forums.mtbr.com/showthread.php?t=291321

HillRider

A $150 tool for one repair? Yeah it probably works but you would need to resurrect a lot of cranks to justify buying one. I don't think many LBS's will have one either.

I think from an economic standpoint the current crank isn't worth saving and just be more careful with the replacement.

DMF 

A cool tool is its own justification.

n4zou

Loctite "Form A Thread" will take care of your problem. Here is the link to get you started.
https://68.72.74.113/USERFORUM/forum3.htm