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Ide stear clear of a fork mount for a newtonian design, they arnt really made for it. I use my 10" 4.7 for visual and astro, so it has the dovetail and rings and also the dob circles on the side, I actually use the dob base for storage as well so after a evening of astro i just sit it back in the cradle.
Do yourself a favor and download a small dos style program called NEWT it will help you design the OTA Secondary sizings and a few other bits and pieces. its very detailed and youll need to put stuff in and measure other things.
Hope that helps mate.
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