Review on Adjustable 90° Aluminum Carpenter Welding Engineering Tool by David Thomley

I bought this collar based on reviews. Didn't expect a Ferrari collar for the amount paid but people look at the pictures - this is just unacceptable. In the first picture, two perfectly square pieces of plywood lie on the base of the clamp. The second and third happens when you tighten the parts. He scatters both parts (separates them). One more thing, there are two high points on the bottom of the base that make the clamp wobble on my build table.