I think I installed one on my Marlin 39A, but its been more than 20years and I may be misremebering. I have the bits and the taps are on the way. My question is can I use a regular hand drill to make the holes. I'm thinking if I installed the sight on the Marlin I used a hand drill. I would also like to know if I have to take the action apart to mount the sight. Thank you.