I dug into my old stuff and have what I recalled using in my NEQ-6 mount, not sure if it is ADM or not.
Diameter is about 76mm, thickness about 20mm, and with a hollowed out "cavity" on the underside of about 61mm.
It started out in life with 3 (or maybe 4) neatly drilled threaded holes. Certainly the closed two are about 37mm apart. I have since *******ized it a bit, and have drilled and tapped 4 more. Looking on the bright side, it's a weight saving idea. Pics may or may not help.
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