Don't loosen up the center bolt until you have all of the parts needed. You are safe for now. The rod and nut that snapped are for tensioning only, not for HOLDING the tension. That is the job of the big pinch bolt in the middle.

Your problem is going to be if you take out the tensioner to replace the rod and nut and the tensioner is marginal. You will have to replace it soon if so.

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