I think I am going to get a valve spring off a Pratt and Whitney Radial engine for the tensioner spring. Then it will stay tight even if the bolt isn't tight. 
FWIW, mine ran for a while without the bolt tight, the threads in the housing stripped and the bolt wasn't holding the rod snugly. Luckily I had another tensioner. It sure was noisy though.

FWIW, mine ran for a while without the bolt tight, the threads in the housing stripped and the bolt wasn't holding the rod snugly. Luckily I had another tensioner. It sure was noisy though.

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