Lots of good ideas here guys, thanks a bunch! Yes, I'm using nylon lock nuts on the back side with washers. Just no washers (yet) between the socket heads and engine lugs. An 8-32 will not go through the Saito 82 lugs without drilling them larger. Just didn't seem like I should have to do that. I'll try not snugging the 6-32's down all the time after flying and we'll see how that does...... will keep ya posted..... PS - I agree with BLW about the black nylon mounts working out nicely when not on a profile plane. I have a lot of fun drilling the holes a bit undersized then putting a 6-32 (or whatever size) tap in the chuck on my little electric screwdriver. The screws never even loosen up a bit in that nylon. Anyone else have a hex drive chuck that pops into your little battery powered screwdriver? Very handy. I even put the Great Planes Dead Center Hole locater in that chuck instead of spinning it by hand. Works like magic. http://www3.towerhobbies.com/cgi-bin...&I=LXK378&P=ML Earlwb, my 6-32 bolts do have a shoulder on them - good idea.