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Dave, one bolt locks the focuser and the other adjusts tension. Have a play with both with the scope off the mount. Sometimes tightning the bolt will release the tube allowing it to move independantly off the adjuster. On my ed80 which had a similar system the bolt had to be fully undone to get any grip. The rear bolt adjusted the tension and the front bolt acted as a lock. Got a moonlite on it now and that fixed all the problems.
Mark
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