After looking further at the mount above, as the zaxis makerslide is 40mm wide and this mount has mount holes 40mm apart It would not be possible to mount on the makerslide, so I reckon on a 10mm or 20mm x 60 mm plate mounted on the makerslide 20mm holes, then look for a custom mount again 20mm thick with holes at 50mm so the screws fit outside the rail from the back into the mount?

thanks again