I think this overhead is driven by a vertical shaft but I'm not sure
http://www.ebay.com/itm/RCA-Cutter-/121063835320?pt=Vintage_Electronics_R2&hash=item1c2ff786b8
The cutter heads are over priced but one still has the orignal 4 pin receptical. And one has a funky stylus heating rig
http://www.ebay.com/itm/RCA-Cutter-Head-/121063814051?pt=Vintage_Electronics_R2&hash=item1c2ff733a3
RCA overhead and cutters
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