Hi guys, I received my new lord mounts and I'm trying to drill them out to 5/16" from 1/4". I have a brand new drill bit and I'm barely starting to make a dimple. I'm afraid to push too hard and blow the center out of the mount. I could try to back it up with a piece of wood, but I'm still scared I may twist the center loose. How did everyone else do this chore? I'm about to take it to a machine shop.
Thanks,
Jay