The Chainlink

Any help from the technical gurus is appreciated:

I have a 70's Motobecane Mirage that I picked up at a garage sale. I have converted it to a single speed. I have kept the cottered cranks, and am getting a bit of slippage due to the fact that the pins are worn. Anybody know what size pins I need to get to replace the old ones?

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Sheldon says they are 9mm, or sometimes 8.5. I just saw a pair of 9mm pins on eBay for $6.45 shipped.

9mm, usually, you need a cotter press too.
I've got both

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