I converted my wing to bolt on after finishing my wings training but left the original parts intact so that rubber bands could still be used instead. Nylon bolts are better than metel. Metel bolts can vibrate loose during flight. Nylon are vibration resistant and hang in there. Found this out on my First ARF. which was a H( Cherokee. After 3 flights I would have to retighten the mounting bolts. Got fed up and added blind nuts to fit 10-32 nylon bolts. No problems with bolts coming loose after that.