I don't like threaded fasteners in these tight holes, as it can be very tough to get the alignment dead solid perfect, and if it's not, the threads can "broach" the holes oversize. The factory planes use pins. It took a few tries, but I custom fabricated pins with a long, gradual taper to help with alignment, the proper grip length, and positive locking via a clevis clip. Starboard side is in and secured.