We think adding a chain guard is important.  If clothes, hair, or body parts get caught in the chain, serious injury can result.   We used sheet metal to make the chainguard.  Since we didn't have a bending brake, we improvised using a 2x4 and clamps:
Once we had the metal clamped on one side, we just rolled it over the 2x4, and then clamped again.  We used extra metal tubing between the clamps and the sheetmetal to keep it uniform:
We made L brackets out of 1/8" metal, welded them to the chainguard, and drilled holes for the back two and slots for the fronts two:
We needed the chainguard to be removable so we can accesses the chain, so we used bolts, which were welded on to the trunion.
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