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I would love to know what other strange things you found with your Mac Newt.
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The 'fix up the mak-newt' project just started today, but I suspect the mirror spot issue might be the root cause for the secondary adjustments being maxed out.
There was a loose screw in the focuser, and it was a fair way out of alignment too - although it might have been in an attempt to compensate for the mirror spot somehow.
The tube is carbon fibre and the focuser is Aluminium - so no problems there, but many of the hex screws and washers have rusted and they don't look too good. I'd love to replace them with some shiny new ones if i can find any. At least I know what all the nuts/bolts/screws do - it should be reasonably easy to get it working at its full potential (finally). A cooling fan might be in order too.
I was really surprised how heavy and steeply curved the corrector plate is. It's more like a corrector brick. Now I know why they don't make 16" mak-newts.
More pics attached.