Today I made up some connecting rods for the inside motion. They came from the scrap etch box and were originally for a Black 5. I cut off the big end bosses from all the pieces and then soldered them together in pairs. Once I had measured the length, I cut them to final size and grafted some Laurie Griffin eccentric straps onto them. I have calculated that the home turned eccentrics will give about 3mm of travel fore and aft but that will be sufficient to give the sense of movement though the holes in the frames.