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jeff80
A Cotter Pin
This is the worst I've ever seen.
The problem was at least partly caused by the rider not realising that the slack he could feel through the left hand crank was actually caused by looseness on the right hand side. The bike was always ridden fixed, and this is a feature of fixed - one worth knowing about.
The crank (a Williams C34) had suffered some damage - the bore for the spindle is a bit enlarged through wear but, even so, a new cotter was all that was needed to make it rideable.
I realise this might have gone in Mechanics and Fixing, but I thought anything to do with cotter pins was a bit too olden days for that column.