From AP Web Page:
15" Ribbed Mounting Plate (1200RP15)
This plate is 14.75" long, 7.75" at its widest point 5" at each end and 1" thick. The underside of the plate is carved into a ribbed pattern to maximize the strength and minimize the weight to a mere 3 lbs. A pair of keyhole slots that measure 3.2" between centers are provided at each end. The distance between the pairs is 13.75".
If you plan to use an accessory plate on top of your rings, we suggest the 15" Dovetail Plate (DOVE15). All Astro-Physics rings (except the Traveler and Stowaway) are predrilled to accept the DOVE15. Rings from Parallax Instruments can be drilled with the Astro-Physics hole pattern, as well.
Used very little, I tried it once on a C14 with Parallax Rings
but I don't think it worked out very well.
The AP1200 mount and Parallax rings are long gone.
Some slight marring from the screw holes.
AP cost is $210.
My price is $149 post paid.
Additional images available showing backside and
screws are available.
I would be interested in trading for a
Dovetail plate engineered to accept the
Takahashi scopes. One the emulated the E10
or E200. This is the 4 hole (2 actually used)
8mm screws on a CN212 clam shell ring.
The one that Texas Nautical Repair makes
would be nice.
If you have something else neat,
say a JMI Motor Focus, that would be interesting.