fabricated a rod by grinding an oversized bolt down and attached it to the cam. Then I bored the adjusting knob out and and tapped it out to fit the bolt. Worked like a charm. Evidently the prior owner had broken the damn thing and got by with the tension being somewhat loose. Makes no sense to leave something like that but oh well its that kinda world today. I'll order a new one and put it on once the water pump goes south. Until then this will be a suitable fix.