Are the two dove tails EXACTLY the same width? If the rear one is narrower, then that will explain why your windage is off. BTW, I have a Simson drilling where the front claw mount was soldered in crooked. Had to jump through major hoops to work around that! A solution can be found--even if it means adjusting for manufacturing mistakes. Good luck.

Last edited by steve white; 10/18/18 12:11 PM.