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Two new wiper motors cost about $50 each off Ebay a couple of years ago.
Although one seems quite happy pushing my 3m dome around, I put the second one on the opposite side.
This did two things: it smoothed out the rotation by cutting out any tooth jumps (on my giant planetary gear), and it served to equalise the sideways pressure on the ring.
They also gave two potential maximum speeds. I chose the fastest and put a speed controller from Jaycar in the line
Cheers,
Neville
LSO
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