Focuser adapter
Description
I was building a telescope designed by [big big space](https://www.bigbigspace.com/telescope/n606-newtonian-reflector) and needed a Crayford focuser. Found a cheap one for a round tube and designed an adapter for it. The manufacturer says it is 80mm in diameter but does not specify ID or OD, so here is the adapter and the freecad model.
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