I went to use this clamp recently. Either the plastic was brittle, or I squeezed the handle too hard. The part of the handle that adds pressure to the clamp broke in my hand. I decided not to discard the clamp and get a new one, but to make a new squeeze handle and continue using the clamp. The photo shows the break.
Step 1: Tools and materials
Angle grinder with a cutting wheel
1/8 x 3/4 inch strap iron
7/16 inch rod
The photo shows part of the broken handle that will be used for a pattern. In my hand I am holding a piece of 7/16 inch steel rod I have ground away to copy the half-round portion on the broken handle. After grinding, I used a hacksaw to saw two cross section slices from the rod. It was necessary to cut a triangle to be welded to the 1/8 x 3/4 inch strap iron.
Step 2: Weld both halves of the handle
The two halves of the squeeze handle I made are shown here welded. Compare the cavity in the blue handle on the clamp and the broken portion of the original handle. I have ground the welds a little to make them nearly flat. There is some free movement in the clamp for the handle, so the welds do not need to be completely precise and smooth.
I cut and ground away some of the triangular pieces welded to the strap iron to fit the cavity in the blue portion of the handle. Notice a chalk mark on one piece and a score mark where I began cutting on the other. I did a little grinding for making a close fit.