Assuming a direct replacement is unobtanium. There is no standard for the rotating mechanism and at leaast 3 headforms: normal , half width R/P plus E, half width R/P. But there seems to be a standard of the heads, all I've checked are set in 15mm Al cylinder with 11mm centres fixing holes. Anyone ever swapped these integral with head ? if required to actually swap heads , what is the best way to unglue/unbond the resin/glue seating them in the Al, heat? Maybe different front/rear-axis length. At least reseating replacement head is not as critical as VCR head placement. Azimuth setting screw seems to be the endstop for the rotating mechanism.