jmsdad, thanks for posting. I thought about doing the same but I did not know what size bearing to buy or where to find them. Hobbyshop?
Even if the stop is not "exactly" at zero it still serves the purpose of preventing the dial from being spun to far and loosing track of zero. Besides, you can return the dial to the stop and either back to zero or leave it. You still need would to look at the dial to spin up.
