IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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the threaded holes on the end of a crank, if they become fucked can the be drilled and tapped? 12mm standard, can they go bigger or would it cause problems? 
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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the fly end?
if there bigger. can weaken it
and with torque possibly throw the fly off
possibly helicoil them but even then id be unsure
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DERV-POWER
Member
Registered: 13th Sep 09
Location: Greenfield, Flintshire
User status: Offline
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you might be able to helicoil it
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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balance would be my main concern - getting it straight etc
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BarnshaW
Member
Registered: 25th Oct 06
User status: Offline
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personally would just replace it with new if in doubt, always wary with these things and reground cranks etc
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Jed D
Member
Registered: 15th Mar 11
Location: Durham
User status: Offline
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as AK said, wouldn't it need balanced rite if you did chance it
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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ive fucked them up then
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Mertin
Member
Registered: 12th Oct 05
Location: Scotland
User status: Offline
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Drilling bigger holes means removing more material and affecting the weight and would make it out of balance. Same with adding larger bolts.
Doesnt take much to put something off balance
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