Thanks for finding that, Dick. Much appreciated. I think I will pick some up. I wish I could see the tip of that special screwdriver. My guess is it isn't more useful than what I currently do -- I use a ratcheting hand driver with an extension that has a sliding screw guide. Once I get the bit on the screw, it's not too bad, but it's still a pain. Even once I get the bit on there and can screw fine, then the claw starts to turn -- and the only way I've found to prevent that, is to stick your other hand up there to hold it. Yea, along with the hot water heater, the water tank, water pump, accumulator, fresh water bridge, various pipes (I take the drain out), etc.
Basically, I use something like this:
...with one of these one the end:
But Bruce's clamps are like 10x better because the claw can't move, and it's a hex. But I can't use them on my sink.
Dave