Gary,
It probably wouldn't be a big deal for your machinist to make #219 driver sprockets from scratch. Why don't you ask him? The advantage of using #219 is that the Extron composite sprockets (only available in that size) are a bit quieter.
It probably wouldn't be a big deal for your machinist to make #219 driver sprockets from scratch. Why don't you ask him? The advantage of using #219 is that the Extron composite sprockets (only available in that size) are a bit quieter.