After many years of setting-up my Teles, adjusting truss rods with small screwdrivers, I had a thought of trying a paint can opener. Maybe other guys here have offered this approach, but it worked painlessly. Took the guard off, slid it under the strings and got an easy quarter turn with one of these. It doesn't bugger-up the screw, as trying to get a conventional screw-driver in position does, since the tool seats straight into the screw-slot. If it's well known here, apologies for the rehash. If not, get one of these for those tough to adjust neck-heel adjusters. My local paint store gives them out, free!