Czechman, I like your clamps. Looks like they are aluminum. I forgot to mention with my straps, I put shim brass stock in to keep the weld from sticking to it. What I criticize is the clamps that places like Eastwood sells. They wouldn't hold the piece in place, much less keep it from crawling. And you have to bump it a little between welds and the Eastwood clamps would probably fall off. The big challenge is to have the two pieces fitting correctly before you ever turn on the welder. I was guilty of that 50 years ago when I still used gas and coat hanger wire. Don't even think of welding until everything is in place.