BelArg is correct about glove panels. They weren't just a chunk of Micarta tossed onto the upper inboard surface of the wing, they were contoured and hence the thickness varied all over the panel.
While they did wonders (so we were told!!) for the aerodynamics, there were dozens and dozens of 10-32 screws required to attach them. The problem with these screws is that the anchor nuts were sealed domes in the wing fuel tanks. Guess what happened if you screwed an over length screw in? Push the dome off and voila - a fuel leak, so into the tank and replace the dome nut. Hence every screw hole depth was measured and the correct length screw fitted. Not a quick job, but it did keep the apprentices occupied.