I don’t have any metal. No scraps, no salvaged pieces, and even if I did I wouldn’t have a place to make any mods at the moment. So yeah, I used cardboard. I really don’t see this working too well…. but I wanted to make sure I was on the right track with measurements and all. At least I have push rods and ball joints right now. Tomorrow I will hit Home Depot and start searching for stuff. If anyone knows a good place to buy metal shapes…. let me know.