I remember hanging out at a gun shop that specialized in building PPC revolvers many years ago and asking which set of screwdrivers I should get to prevent marring the screws on my guns. I guess my jaw dropped when they all replied Sears.But the first thing to do is get a set of gunsmith screw drivers so you don't booger up the screws. And you can find sets of hollow ground screwdrivers at some of the tool stores like Harbour Freight and Northern Tool.
What they would do is buy Sears screw drivers and grind down the tips to fit whichever screw they were working on...I guess it was fairly common practice in the 80s