I bought a used Optima 2000 red dot and installed on my Lew Horton Comp .40. Windage adjusted fine. Elevation also adjusted fine except I was hitting low at max adjust. So, I bought a tapered shim and ground down some new longer mounting screws. I go back to the range and no surprise I'm hitting high now. But, I'm way left, too.
More bad news. My adjustments are both dead. I no longer get movement either way. I take the shim off and go back to original screws and yeah, I'm close again, but adjustments still don't seem to respond. What happened? What did I do?
I hope I'm just making a couple of mistakes here and somebody can guess at the cause of my problems.