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@M_V
I had a Puch with cottered cranks that was my commute/winter bike for many years and the only issue I had with the cranks was when the swaged on chainring started coming loose.
I think I avoided taking the copters out as much as possible and somehow managed to disable the bb cups enough to squish some fresh grease into the bearings with the cranks still on the spindle.
I must have taken them off when I had the frame powder coated though.
Aiui it’s the cotter pins that are the issue now, they’re all the same shape/size and made of shite metal. Bitd there was a range of sizes and they were more solidly made so didn’t tend to work loose.