If you do not have a fixture for drill the hole for the Graco or Gra-Coil, disaster is bound to happen. Most times the larger hole you'll need to drill will incompass part of the original stock bolt hole. There's no way to drill this with a hand drill unless you use a piloted fixture.
I made a drilling fixture for both the Graco and the Gra-Coil. Each one needs it's own.
Send you stock to Graco and speak with Tracy. I just got my Ljutic back and what nice work they did. Their turn around time is as good as it gets. Do not forget to tell Tracy what LOP you want. Hope this helps, Roy