Derailleur Pulleys: Old Atala
I'm restoring [actually, more like rescuing] an old Atala Grand Prix. . .no great value or hot performance. . .mostly for Chuckles-and-Grins and an excuse to listen to NPR.
Issue: The derailleur pulley teeth are worn to nubbins. It's got '70s era Campy low-end derailleurs.
Question 1: How do I determine which off-the-shelf pulley to replace it with?
Question 1a. Is it just the number of teeth that makes the choice for me?
Question 1b. Do I need to be concerned with the size of the hole in the center?