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You need either an extension shaft, or a 1kg weight placed above the
2x 5kg ones. You can also gain a bit by inverting the bottom weight
so that the knurled retaining screw that stops the weights falling off disappears up inside the weight[allowing the weight to be a little further
out along the shaft. This together with the 1kg weight should be about spot on.
The scope should not be perfectly balanced; it should be balanced a
bit against the drive direction in order to eliminate any backlash in
the gears.
raymo
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