Hello,
I wonder if this kind of thing has already been presented here?
Well, anyway, very useful thing especially for handling smaller bolts and nuts and when you have to extend your hand flat to bring the fastener etc. to it's place.
Cheap and simple. Made of duct tape to fit your preferred finger, and has a cutout for housing the pieces. Can be further improved with a small piece of magnet.
Can be stored easily in a pocket, can be squeezed, wrinkled, dropped, greased, chewed etc. and still works, unless totally splitted. Works in all conditions, fights against gravity, does not nag.
To prove its usefulness even further, Lee Valley has a commercial version called "Finger wrench". I prefer tape model, it does the same and fits perfectly.
sumu