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[ATM] Dobsonian

Hello

Could somebody show me links on the internet or refer me to books or something that shows me how to build a dobsonian telescope?

For my 20" mirrored, 24" tubed telescope should I use altitude circles of 20" diameter or more?  Or maybe 25" diameter, 30" diameter (if it were 30" in diameter that would be good because I already have some cut up that way 2-3/4" pieces glued and screwed).

Then what about the azimuth bearing?  What should I use for that?  A piece of teflon; and where would I get some teflon?

Does anybody know where to get teflon?

Thank you.
David

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