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I've bought a variety of springs, and cut one down to try out. I think with this setup the primary mounting cell now sits somewhere between 5mm and 10mm further forward in the OTA, but hopefully this won't have any detrimental effect. The mirror itself moves more than 50mm between all the way forward and all the way back when using the stock focuser.
I'll do a quick daytime collimation in a few days and then see how it all works when I fine-tune with a star.
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