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I've never liked the way celestron fits their dovetails to the ota's. Another idea is to make a semi-circular ring for the rear that would reach the side mounting screws and use the single front mounting screw (most of the weight is at the back of the tube). Then you could either screw this ring to your dovetail or replace the dovetail with steel flat bar 40mm x 6mm, welding the ring to the bar. I've done something similar to this with an old Meade ota, but it looks rough as guts due to my poor trade skills and lack of proper tools. It works well though.
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