I get cotters from my LBS, but I expect they are "the cheap ones" and probably not unlike what you'd buy on ebay. I'm curious about these "good" cotters. How do you tell a good one from the rest? My dad had a cottered crank on his bike when I was a kid, but I never had one until a few years ago. I don't recall how cotter pins were different before. These 9.5mm cotter pins have a nice vintage-looking nut and file marked: New Cotter Pin for Crankset 9 5 mm 43 mm Vintage Bike Old Bicycle French | eBay Would you consider these "good ones"?

+1 to the Bikesmith press. A great investment if you expect to work on cottered cranks, or, like me, enjoy excuses to buy a new tool.