Ron, your screw on mount looks similar in many ways to that on Old Colonel's DR, with the exception of one claw. The claw is wider. Make use of all the room below and to the sides to keep it as beefy as you can. The depression beneath the base is curved, ostensibly to allow the front of the claw to be beveled in order to snap down past the beveled front of the slider. I personally don't like that feature in that I like to keep the hook as stout as possible (having had one fail when shooting a slug--bending one hook to the breaking point), but that is just me. There is so often so precious little metal left beneath the slider in the first place! And some gunsmiths even want that to be specially hardened. I believe Kreighoff made the single hook rear mounts for a while. POLISH to final fit, or polishing at all may remove more metal than you want. Take as long as you need to get it perfect. Tight is everything. Good luck...Steve
