Yep, speaker magnets are the go. Go to Spotlight and get some stick on felt and they will not scar your tube too much. Balance is one of the big problems with the GS mounts, their Alt bearings are just too small. Since going up to 12" bearings I no longer have to use my magnets.
If you cannot find some old speakers then I have also seen ankle weights from sport stores used. They are soft and have velcro straps so they are easy to put on the scope. Worth a look.
Cheers
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