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I have one of these mounts with an original Custom 60L on it. Yes it uses rings which are clamped to the end of the short bar. The only way you could use your 1/4 20 screw mount is to fix it to yet another aluminium plate the same length as the mount plate and use two bolts perhaps with wing nuts to fix it to that plate. This mount has limited slow motion movement, and has to be locked in azimuth to obtain that slow motion control. I suggest you make your own wood tripod for it. I use the Vixen one but have fixed the height at half way up and used through bolts in the legs to gain more rigidity.
I should add that the altitude should be set at such tension that the mount will swing up and down in altitude with a firm push. It should then hold so you can use the slow motion control.
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