Good advice (above). I keep several spares and look them over pretty closely before putting my wing on the plane. The big plus with nylon bolts is that they will shear upon stress and this will usually save a wing. I had (sold it) a Four Star 40 that I did a summer salt with. On the second flip, the bolts sheared right at the base of the bolt head. The wing went left the fuselage went right. All was ok minus a ding on the wing tip. I was lucky. It was going rather slow on landing and I should have gone around.. but.. well, we all were new pilots at one time.

I lost a Venus 40 a few months back. The fuselage was.. well, there wasn't a piece of not-broken wood in the fuselage. The wing, however, which came off (sheared nylon bolt) was totally intact. Strange... but true.

DS.