I always just weld mine on, but I know what caps your talking about. Can you weld them? I would look at a boat trailer parts place that large of caps are what are used on the rollers on boat trailers.
Current Smokers: Backyard RF Offset and Hybrid RF Offset trailer rig with Cowboy cooker and fish fryer, always room for more........
I could weld them. I just assumed that the springs needed to be free to rotate around the rod. Do you just tack them at the top and bottom when you weld them?
I put a pretty good weld on the end of them, actually almost completely around it. It doesn't need to rotate your hand will do that as you open the door.
Current Smokers: Backyard RF Offset and Hybrid RF Offset trailer rig with Cowboy cooker and fish fryer, always room for more........