Too clamp mine I used two 1/8" thick pieces of steel that are about 1"X1" squares to keep pressure equal across the connector during the crimp and a pair of vise girps for clamping. It worked pretty good. I actually prefer the crimp connectors to solder. The solder connections are a pain to insulate correctly. If I keep messing with the flex watt I will probably weld the two pieces of steel to a pair of vise grips to make it a little easier.