If you are going to use blind nuts, you need to use type that daveopam is talking about. The barbed ones will loosen up with the constant screwing and unscrewing and the last thing you want is a nut on the end of one of your wing bolts that you can't get off.

The drill tap ca tap is the only way to go in my mind. It was mentioned before that using that methond works well on LG and that has provent correct for me. When I was first learning to fly, I bought nylon screws by the dozzen from the Ace Hardware as I would usually shear off a landing gear every couple days. THe LG mount was 1/4 aircraft ply drilled and tapped with CA hardening. I never doubted the holding power of the threads and in fact even on a couple crashes that destroyed the plane, the thread in wood was intact and the stubs of the screws still in place. That method just will not fail you.

Don