As Vasco is confused, I've just done a couple of quick scribbles to back up the cell-wiring illustrations above. Sorry about the crudity of the scribbles
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Remember, however, that the Ferguson which is the subject of this thread has three wires beneath the tonearm. Some variation of the wiring illustrated below may therefore be necessary. Alternatively it might be possible to add a fourth wire, connect the four to the SC12 as normal, then do the linking at the tag strip beneath the deck. This can certainly be easier than fiddling about at the cartridge terminals.