Hi Greg,
The upper tensioner is the one that goes. The lower tensioner is just an eccentric roller and is best checked for good bearings but in my experience, rarely goes. It might get just a tad noisy when spun but if it's smooth and has no play, it'll live to fight another day.
You'll more likely find the top spring tensioner seized or feeling like it's full of threepenny bits.
In extremis, the bolt snaps because of the lateral load the failed bearings puts on it. I find that on initial start, a worn tensioner jumps up and locks itself in the fully retracted position and thus the belt ruuns loose and flaps around.
That SELL WITH on the GSF site is a bit of a misnomer. What they appear to be referring to is the tensioner spring. Very unlikely to fail I would have thought
A sent PM initially goes in the Oubox and then into the Sentbox when the recepient has read it. The fact you're on AOL should not matter I would have thought. Send me a PM as a test Greg...