Vixen dovetail Clamp for Tube rings.

The adapter I made for my Meade 6600 worked so great, that another telescope I got an Orion Astrograph 203mm/800 (8" f/3.9), I wanted to do the same thing on. I'll probably also be using it for my Spaceprobe 130ST. Unfortunately on both of those there's only a single 1/4-20 hole per tube, so I made a mount to keep it stable on there, with supports. (30 mm wide on the Astrograph, and 25mm on the Spaceprobe.)

This fit perfectly, and aside from what should be a corrected issue (Namely that the bottom interfered with operation of the bolts, so I cut it down a bit.

Parts needed, this can of course be adjusted in openscad (sorry, I used multiple files so no customizer version):
1/4-20 screw (Probably 1 inch, with a button head.)
2xM8 screws to hold the clamp on.

M8 Tap (I use the harbor freight drill/taps, which work excellently on 3D prints... but not so great on metal.)

Works great to hold a Celestron Travel 70 telescope on.