I shot the threads on my cranks when removing an incredibly stubborn pedal last night. (lesson learnt - never ever install pedals without grease/lube and then forget about it until 5 years later!) Current crankset is Shimano 105, I'm looking to get a replacement left crank arm 172.5mm in black. Would happy consider used ones - am on a budget and the bike is only a winter bike so don't want to fork out money on brand new crank arm if I can get a second hand one for cheaper. So don't suppose any one of ye have a spare one lying in your shed that you'd be willing to sell?!