In addition to the adapter PCB, I/m looking into using one of the following types of pins to make the "P" side of the connector:
Have some in the Digikey cart to try them out to see how well they fit in the Diablo "S" side of the connector.
Pins on the Diablo MRAC42P are 0.062" diameter.
To make the "P" side of the connector, do something like this:
1. plug 42 pins into an actual MRAC42S, such as the socket on a Diablo Terminator
2. fit the adapter PCB over the solder tail side of the pins
3. solder all 42 pins
4. unplug the soldered adapter from the MRAC42S
It might be necessary to fit a thin plastic 3D printed piece with 42 holes over the base of the pins after soldering, not sure about that yet.
The mounting screws are a harder problem. A thumb screw, aka shoulder screw could attach one side. The part with the nut in the shaft I don't know yet. Maybe something like a shoulder screw permanently fixed to a round metal threaded standoff.
However, the first step is to just make a Diablo adapter using a real MRAC42P and confirm that it works.