I'm after a cotter pin that I can insert and remove easily by hand. At least I think I want a cotter pin if it's one of those pins with a shoulder at one end and a hole for a split-pin retainer at the other end.
These will be 6mm diameter, 2.5/3cm long.
I guess a basic solution would be a standard cotter pin with an R-clip in the hole to retain it but I'd like a more user friendly version if I can find one.
I seem to remember seeing somewhere pins that have a section at the end that folds in flush with the pin for inserting and then flips out to retain the pin. This would be ideal if I can find a name for such as there isn't an R-clip to lose (or get stuck).