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Max,
I have five old 6 cm diameter speaker magnets, roughly 300g each = 1.5 kg total. They don't sit well on the tube and tend to slide around. I stuck them on the frame in the bottom of the tube as the metal parts of the cage are exposed. This also gives you the maximum radius to fulcrum distance.
You must have added some extra weight to the upper tube for this to happen. In my case I replaced a lightweight red dot finder with an 8 x 50 finderscope. I'm surprised it moves with the clutches tightened. Is there some way you can adjust or modify these?
Just had another thought. My scope drifted downwards with the extra weight up top. Yours is drifting upwards because the barlow and EP are too far off axis. Can you try a shorter barlow (e.g. Orion Shorty Barlow) if you are using 1.25 inch EPs? Or just get a lower focal length EP and don't use the barlow.
Regards, Rob
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