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Ben
If your dad has a milling machine may I suggest he knock you up an x/y shifter. I can send you photos of one I had made up and since the 90 mm
mak is solidly bolted to the main scope via the losmandy rail, I use the x/y finder and a parfocal eyepiece to find and centre a guidestar. Very quick, easy and fool proof. And no flexing. Rings I find are almost certain to give flex between the main scope and guider as the mount tracks. Others may disagree but that's been my experience. At the moment I can easily photograph at 2500 mm fl using a dsi ii pro cammera and that's normally tough to do due to the magnification.
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