Wow, thanks for the great advice, everyone. I've got the cassette off:
Originally Posted by
Gonzo Bob
So what is that, a 12-23 7-speed? And you want 13-21 7-speed? You might be able to find the needed Uniglide cassette cogs to make a 13-21 at loosescrews.com. Just make sure the 13 threaded is NOT Dura-Ace since that threading is different.
It had 12t-22t 7-speed (I'm guessing this is how they came from the factory), so I ordered a 13t (threaded non-dura ace), 16t, and 21t from loosescrews in order to get to: 13-14-15-16-17-19-21.
Here's the bike, otherwise completely overhauled (with the wrong wheels on it):
I'll post an update when I've got the cassette reassembled and the hub reubilt.