Hugh Manatee
Veteran
I've just had a read on Sheldon Brown's site about removing cotter pins and it sounds frankly terrifying! Still at least I'll have two bikes to practice on...
I don't know if the Sheldon method is the same as this, but feel free to try it. I found an old Moulton waiting for the scrap man. I grabbed it and decided to restore. The cotters were stuck solid. After a good soaking in Plus Gas, find a half inch drive socket. You'll need one large enough to fit over the end of the cotter with enough room for it to move up into the socket (giggidy).
Now get a large vice and with the socket over the end of the cotter, use the power of the vice to push/squeeze the cotter out of the crank.
I had to use a short tube to give me extra welly on the vice handle. After not much time both of them popped out and I was able to dismantle the BB. This, as someone mentioned was in very good order indeed. I replaced the cages with loose bearings and used new grease but the BB surfaces were more or less perfect even after 45 years!