Lopping off the tip of the bolt at about a 45 degree angle works well too. It's easier with a Stanley type knife than with a small hobby knife. No dressing up of threads is needed. The bevelled end finds it way into the nut and the bolt catches threads and lines itself right up.

Related point: many modelers use nylon bolts that are too big. I have seen .20 size models with two 1/4-20 bolts! If you hook a wingtip on landing these will tear up the fuselage. I use two 8-32 bolts on .40 to .50 size sport warbirds. This size bolt on this size airplane will shear like it's supposed to if the ground attempts to twist the wing off the fuselage but it will hold the wing on just fine under tension against aerodynamic loads.