I have several gear pullers from little bitty ones to some pretty good size ones. They all have one thing in common. They have more moving parts than I have hands. I hate to have to ask some one in the shop to come help, but I have never found a good way to hold 3 or 4 legs on a gear or pulley with one hand while trying to tighten the screw. It gets even worse if I'm using a end protecter under the screw. What are some of the tricks you've found useful?