Damaged crank extractor/dustcap threads...

http://www.bicycletool.com/threadchaserforcrankarmdustcaps.aspx

Some dodgy bustard tampered (tried to nick it) with my left crank (i always lock right one :)... it seems to me that he tried to remove crank with something sharp, probably knife [hehehehehe] or flat screw driver.. while doing that he fcuked up thread halfway through [not severely]

I hesitate to use crank extractor [for sq taper] as it will damage threads further more... on the other hand I'm desperate to repair it [crankset: 1973 campy record pista 165]

My question is:
Has anyone used piloted Thread Chaser TC - 8 for extractor/dust cap thread? Any luck?

Please, let me know if you had the same problem and solved it...

Sorry you've had no replies. I've never done this. Have you ever cut a thread before? Maybe your record pista cranks aren't the best place to have a 'first go'. Have you tried screwing in the crank extractor and seeing how far it goes in easily (don't apply any pressure)?

oh deary me.....
you could manufacture a wedge type system to lever the crank off.... between the BB and the crank arm.
that would preserve the cranks without hitting it with a lump hammer.

once you've got the crank off you can properly chase the threads ?

nice cranks. the thieving bastard obviously knew they were worth stealing.

i'd run the extractor in as the threads are pretty deep.

Sorry you've had no replies. I've never done this. Have you ever cut a thread before? Maybe your record pista cranks aren't the best place to have a 'first go'. Have you tried screwing in the crank extractor and seeing how far it goes in easily (don't apply any pressure)?

I have cut threads before (back home my father has a workshop), but in the UK i have no tools nor vice and etc.

Problem is that beginning of the thread is damaged... that's why i have chose piloted thread chaser... another option is to try and remove BB without extracting L crankarm (i know it may be tricky or impossible) as i have a little bit of space between crankarm and bb cup to try and tuck tools in.... and undo bb lockring/cup.. has anyone tried this?

thanx for your compassion guys...

i was considering a wedge type system (one used for bmx and generally un-extractable crank if i'm not wrong), but it looks destructive and savage in terms of the damage to bb bearing cup on the other hand bb cup is cheaper easier to find than L pista 165 crankarm

it should be absolutely fine if u say use a piece of carpet or pieces of thin sheet ply wood on the BB and crank side to protect things.