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Andrew—
Thank you.
As for the span of motion, one full turn with the azimuth handle yields about 33 degrees. The elevation knob is very sensitive—yielding about 0.5 degree per full turn.
The choice of sprocket size was pretty much limited to the tooth gap in the bicycle chain. I asked the bike shop owner to sell me the smallest sprocket available. I think the sprocket-to-chain ratio is just about right.
Best,
—Roy
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