I can imagine using different bits for pilot holes could lead to the final hole wandering a little. Personally I mark w/ an awl, then a punch, deep...

Last mount I did I thought the recommended line was off when measuring from the tail. But measuring from the tip, the lines were in the same spot....

When you mentioned getting pulled up to 18k I was like shit, pretty sure the flights from Hayden to Denver fly at about 20k…

So cool^ Used to live in the boat. One of my coworkers was into hangliding and showed me a few places around the county where he’d take off from....