Bar clamps are great tools, but sometimes it’s tough to get a good grip on the small wood handle. To get extra torque, I drilled a hole in the handle and inserted a dowel. It gives me a lot more twisting oomph with a lot less hand strain. I drilled the 3/8-in. hole 3/4-in. from the bottom end of the handle to avoid hitting the bolt that extends into the top of the handle.