Thread title says it all really.
For reference this is a Shimano Deore XT Hollowtech crank.
Looks like a combination of cheap/slightly wrong sized allen key in the hex bolt and also a little over-tightening. Needless to say the hole is well and truly rounded. Lesson learnt for next time...
So i spent most of last night trying to find out the easiest and cheapest way of fixing the issue - I need to get the crank arm off to replace the middle ring on the other side. The cranks are also stiff to turn making me think that I did something wrong last time i put them back together.
I've seen 3 possible options for fixing:
- Buy one of those tools that screw into the knackered bolt and allow you to back the bolt out. This sounds a bit fiddly and from what I can see from googling, the bolt is liable to break if not done right leaving you with a hardened steel bolt in the middle of whats already knackered.
- Make a groove in the bolt so that a flathead screwdriver can be used to undo the bolt. I'd be up for giving this a go but the bolt head sits inside the crank arm and I don't think I have the necessary tools (dremel?) to make the groove unless someone can suggest an alternative?
- Epoxy an Allen Key into the hole, leave to set for a number of hours and undo. Seems to me like it could be the least hassle route, although I've not done anything with epoxy before. Does this generally work or am I likely to be left with an even bigger mess than when I started?
I've also tried to hammer the next size allen key in but the keys I have are way too big.
I'd prefer to keep it out of the bike shop unless it's going to be significantly less hassle than me doing the work but at the same time, I'd prefer not to shag the cranks.
Anyone have any experience of doing this? Can you point me in the right direction please?!
While we're at it, I'd really appreciate it if someone can suggest a reasonably priced torque wrench/tool - I've not bought one before but think I'd be looking for 5nm to 20nm to handle most of the things on the bike (seems like the only thing above 20nm is the BB which needs 40nm but that's bike shop territory for me atm).
EDIT: Appreciate this has been covered on the forum beforehand. Just need a pointer on the easiest way to fix which other threads seem to differ on, depending on crank type.