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Easier way...
Make two ballast weights about 200g and 400g, with an easy attachment method (even Velcro will do). Pill or drink bottles with sand in them will do nicely, as you can add or subtract to these whenever you need.
Put an attachment point on side of the tube opposite to the eyepiece (this will help keep the centre of gravity central, too).
Balance the scope for the heaviest item.
When using the lighter eyepieces, add ballast to the scope, either 200g, 400g or both to get 600 g.
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