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sometimes it helps if you do not fully insert the barlow into the focuser. the same can be done with the eyepiece not being fully inserted into the barlow. I have a GSO Dobson and found that certain barlow- eypiece combinations require the eyepiece to be a little out. the two screws will still hold it firmly in place. give it a shot. if that doesn´t work either, then send the barlow back and get a powermate. they are pricy but you get what you pay for and won´t look back.
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