[:@]I have often "slipped" while screwing control horns onto elevator / rudder / ailerons.... an inevitably put a hole in my new plane's covering. But a light bulb went off in my head the other night while doing this same operation. I used a small pc. of fuel tubing..3/4" approx. and slid it onto the hobby sized screwdriver I was using. The tip of the fuel line went over the screw I was screwing through the control horn and kept the tip tight to the screw instead of slipping and going through the covering again!!!
Thought I would pass it on!!!!

What i use is a 2-56 socket head cap screw with a ball driver. No holes that way either.

Dennis