Properly done, nylon bolts are far superior to rubber bands. Notice the word--proper--which entails quite a few items. Use proper size bolts. Have no play between the wing and the material the bolts go into, i.e. flush with the wing so that, in case of a side load, the wing and the mount act like scissors to sheer the bolt. Adequate strength in the wing where the bolts go through and adequate attachment of the blocks the bolts go into in the fuselage. As to size, for 6 lbs or less; use 6X32 , for 6+ to 9 lbs, use 8X32 and for 20 to 15 lbs, use 10-32 nylon. If you try to use the 1/4X20 all you get is a removable wing with no crash protection; it will either tear out the wing or the fuse or both on a crash.