Richard, I know what you mean! I am really trying to knock that down some as I find myself getting to the point of drilling, then, start second guessing myself and get into a check / recheck cycle! Whenever that happens, I always remember John's famous words "we are not building a swiss watch" and the CAD program gets everything down to the most minute measurement. I stay within 1/32" or less tolerance.
So, with the help of the daughters boyfriend, I made a new set of shims that covered the gap better and re-leveled everything and plopped the mount back in. Everything squared up, went through the OCD cycle, took a deep breath and drilled it up to #30! Now I am ordering a 100 degree 1/4" countersink as I didn't have one..
Did you guys upsize to 1/4" and then countersink for the bolt blush fit? I thought I read something that some folks upsized to a certain size, countersunk , then upsized to hole to bolt size?