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Malcolm - bintel are great to deal with - if you take the OTA in minus the focuser - they will let you try out their low profile one with your camera i imagine. The longer bolts at the mirror end i think is good if you only need a small distance like 5mm-10mm..once you get more than this you will have to cut the tube
Keep in mind for visual you will then need an extension tube to reach focus with your eyepieces, usually the 35mm one is sold.
Lastly your scope being 900/130 gives f7, which is getting to the slower end of newts for imaging - most use an f5 - the other thing a lot of 130-150mm OTA now come with a focuser which has a camera t-ring attachment, and a screw on focuser which naturally sits higher so no ext tube is required.
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