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Interesting. Do you find you have "cogging" with the toothed belt drive, or belt flex (or stretch induced oscillation on a guiding correction)?.
Ive seen these harmonic drives are used on (at least one) mounts. Cant tell if PE is eliminated though, what do you think?. A well tuned, slightly out of balance G11 doesnt suffer any backlash effects, would be similar for the EQ6 methinks. Is zero backlash worth the effort?, is that the only benifit for astro?.
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