G'Day Roger
No, I mentioned in post #10 that mine is non-Gemini. I plan to use an Argo Navis in (much) preference to Gemini. The Digital Drive motors are steppers and use the RJ-12-style plug rather than the DIN.
I had Gemini on mine for a couple of weeks but removed it to go back to the standard stepper system. I can't remember just how the Gemini servo motors were held on. I take it they are as Peter has described.
Sorry - I didn't realise until your last post that you had Gemini.