U-bolt chain tensioner. Idler is from McMaster-Carr, bolt from local store. We were originally going to spring load them, but that didn’t happen. (Chain’s too short) Worked wonders, once we replaced plain vanilla nuts with nylocks, they didn’t fail. Held up to Semifinals against the alliance that ended up winning VCU, and we were playing rough and tough defense.
We’ve moved up in the world from the HDPE block tensioners of last year.