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Another discovery concerns my seating position. I was sitting on an old adjustable office chair and, even on the lowest setting, my back was a bit sore after hunching over with the OTA close to horizontal. At the other extreme, I don't think the topmost setting would be high enough if it were pointed at the zenith.
So it looks like I'll be making a seat out of timber with a sufficient range of adjustment. Plenty of ideas online.
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