If all else fails, get off your lazy  and turn the damn things by hand. I think you might remember how to do that, right?  But most importantly these things are a luxury for your convenience.

I appreciate all the input great stuff.....part of the reason why I am looking at these things is that I have bad arms. I put part of a motorcycle through one of my hands. Then, I had both of my arms reconstructed due to a nerve disorder.  Was told at one point I probably wouldnt be able to use my arms anymore I'm getting better but it is really hard for me to turn a wrench sometimes (and even harder to admit it publicly lol)  I hate asking for help from my friends though they usually dont mind. Vibration is another issue for me because of sensation problems. not trying to whine here i hate whiners......... thanks again keep info coming!