I use snap ring pliers as spanner wrenches. And all those sets of cheapo screwdrivers are usually too thick at the tip, and that's how you chew up screws. So I file them thinner. When screws are too tight, I use the thumb of my left hard to push down very hard on the end of the little screwdriver, and a pair of piiers on the shaft to "break" the tight screw free. That way it doesn't slip out and chew up the slot. To put screws back in, I sometimes put a dab of hot glue on the screwdriver tip to hold the screw so I can start it. All self-taught hairbrain ideas.