It has MCRX on the motor housing, and two-prong AC - so it is the ancient version. No springs mounted external or hidden inside carriage tubes - I found an ancient manual with parts views.
To clarify a little - the carriage has been completely removed from the frame - there is no influence from a gear/rail offset - when turning the manual control, there is only the gearbox and the shaft inside the lower carriage tube, and oddly, it turns harder (slightly) in one direction vs. the other.
I'm going to degrease the gearbox, re-lube, and reassemble - probably will be about the same, but had time to see if it could be tweaked :-)
Thanks all for the information
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