Originally Posted by zandoval

9mm cotter pins with nuts are easy enough to find. Amazon has them for 4$ USA. But understand that getting a proper fit on a cotter pin requires you to do a final manipulation. Not all "9mm cotter pins with nuts" are the same type and size. I take my new pins and go through a detailed tuning per say with micrometer checking angels, tapper and length. Its not hard. Put them in a bench vice and tune them with a file. Don't be surprised when you find out they usually are different for each side of your crank.