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Dob on Aluminium Rings
Here's my first attempt at a Dob. 12.5" F5 . It rotates (RA) on a ground ring, and in Dec, the rings sit on bearings on one side and teflon skids on the other. Is very smooth to operate.
I'm currently building a new 10" version.
There's certainly a lot of interesting designs out there.
Brian
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