Attached Link: http://www.3dmenagerie.com/

heyas; try my grip hand poses; one is a power grip, and one is a dex grip. the dex grip angles the fingers so the gripped object lines up better with the forearm. try it yourself: grab (or pretend to grab) a hammer to hammer some nails. you hold the hammer perpendicular to your arm. you can't side-side your hand 90 degrees to get it to point along with the forearm. now grab (or pretend) a screwdriver to drive some screws. you can point the screwdriver more parallel to your forearm by a little side-side and doing a progression on the fingers... aw, just go download the grips! :)