I haven't seen anything for what I think is a reasonable price for clamps. What I have noticed and am going to do is to straighten the mating surface where the clamp ends tighten. The get bent inward towards eachother and make it harder to tighten the phillips head. I'm gonna flatten them up because on the one or two I have done this to they clamped better
Also get some fresh bolts in there not the worn out JIS stuff