[callcoy]

Tig welding is a must, don't fool around with screws and pop riviets unless you are an engineer and have calculated the loads. The sheet metal should be heavier than lighter, say 14 ga. Your nut (s) should be in a shear plane, meaning the pull should be across the fastner, not where you are trying to pull the bolt out of the nut.

If you need the special shouldered pivot bolts, I have a bunch, email me, you pay the frt. the rest is free. I am on the road, may be home May 3rd. or may have to stay untill the second week of June. Most all the bolts I have are SAE-NF thread, usually 7/16", so if you get ahead of my return to check stock, just use 7/16". If you can wait, I will look them over and let you know what other sizes I have. My email is listed if you click on my Barn name.