Thanks, I will take out the non-pushing opposing screw and measure the screw’s tpi. That should not shift it in the dovetail.

I can then adjust by using the pushing screw.

I have calculated that I only need to move the back ring just over 4 thou left.

I will boresight again but in the end it will come down to Trial and Error.

Last edited by Parabola; 02/06/24 06:21 AM.