There is a nut on the back side, 15mm I think, so the whole thing may be turning. Sounds like you have to tighten the bolt up a bit to get it to loosen the spring. Slip the 15mm open end on the back side and tighten the 24 up.
Take a picture of how the belt runs because it will give you a stroke trying to remember how it goes.
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Jon
1966 912, 1976 911
1986 944, 2000 Boxster
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