I was drilling a hole to install a navigation knob on my STS 11. The knob has an M12 bolt. My set of drill bits is imperial (non-metric). 3/8" wasn't large enough but close. I didn't have a round file big enough to enlarge the hole gradually and lost patience and used the 1/2" drill bit and made a mess. M12 bolt is 35mm and about 5mm longer than I needed it to be (couldn't find 30mm one) - should probably just use a nut and the whole thing is not very secure due to the too large hole and bolt that's a little too long.
What is my best option to proceed? Some things to keep in mind:
- Inside of tube is flocked
- Navigation knob position selected was the optimal position for me--would like to re-use the hole position if at all possible