A guy could just stick a piece of pipe in there and hold it in place with a couple u-bolts or exhaust clamps. I wonder how clangy or squeaky that'd be? Could easily "adjust" it by tightening or loosening clamps? But it'd probably require adjustment regularly, or maybe not? It wouldn't be ideal and would wear out eventually. I can get all the parts easily, it's just the incentive I'm lacking.