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Hi Mike,
I have the Black Diamond ED120, which has the same focuser. When I first recieved it, the action was a bit too loose, and I had a bit of slippage in near vertical position. Basically I checked all the grub screws on the underside, to ensure they were not loose. Then with my camera in place (which is the heaviest item I have that hangs off the ED120, and it weighs close to 800 grams), I slowly tightened the central grub screw until the focuser performed to my "expectation". I do check it now and then, but it seems to perform pretty well.
Hope this helps.
Cheers,
Daniel
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