I put the cranks back on my '72 Raleigh last night and when I installed the new cotters the pedals didn't sit exactly 180 degree apart. I understand that I need to file the flat on the cotters to change the angle to fix this. Should I be filing both cotters or just one of them?
In Sheldon's Cottered Crank Article he says
My concern is that I'm using 2 brand new cotters, I bought a 10 pack from ebikestop.com. How could they be mismatched?the depth and angle of the flat varies considerably. For this reason, it is best to replace cotters in pairs. If mis-matched cotters are installed, the cranks will not be 180 degrees apart.
This is my first time installing cotters...any advice would be really helpful, thanks.