Bought this grinder used but its almost new condition. Wonder if I am missing a part. How do I keep my dialer from moving after I have dialed in the perfect calibration? The dialer is very stiff but moves VERY slightly after a use or 2 throwing my shots off. Went back to my RR45 which for all its short comings, works perfect once its dialed in. Searched online but I didn't see anyone else with my issue. Burrs are new.
Any advice would be appreciated.

If by "dialer" you mean the upper burr threaded brass grind adjustment ring, it should be fairly tight and require some force to turn via that small rod attached to it. Part of the tightness is due to 3 springs that sit in holes in the body and they exert pressure on the upper burr carrier when the adjustment ring is screwed in (note it is reverse threaded). Sounds like yours is loose. Threads could be worn out or more likely the springs are weak or maybe even missing or the incorrect size.