Am looking for someone with a Vixen GP mount who could help me out...
Looking at the polar scope end of my Vixen GP mount there is a graduation ring setscrew to the left of the RA vernier scale, a black RA circle and a silver-gray calendar date circle. When you loosen off the setscrew to use the mount, how tight is the black RA ring when you turn the ring by hand? When I loosen off the screw and turn the mount head in RA, the ring sometimes moves with it and other times turns and slips, which is clearly not how it should be. My RA ring was a replacement ring so its not been greased, if that's what's missing here. The point is, I cannot see how to tighten it up to generate the correct amount of necessary friction. Any ideas?