As you may know I have a condition called "Elemental Tremors". It offers some challenges when working on models. recently I was using a screw driver on small slot headed screws. I resembled a conductor waving his baton all round. I was every where but on the screw. Frustrated I put a small length of clear tubing on the screw driver and problem solved.
I probably reinvented the wheel but anyway for you young guys remember it for when you get older.
I sometimes do this with selotape - it helps getting screws in hard to reach places! ;D