Hi Coalburner
I made and fitted a cone clutch to my Denford 280 probably 10 years ago now, which is geared head, but has adjustable cone pulleys for variable speed control.
My lathe is converted to single phase which doesn't really like being switched on and off frequently, which is why I originally did it, but having fitted it, I wouldn't want to be without it and it's used very frequently.
I put the clutch in the original motor position connected to one of the cone pulleys and moved the motor position to drive the clutch by a belt.
My lathe was bought cheaply and in poor condition, so hacking the thing around to that extent didn't really worry me – but had I had a near new or expensive lathe, I would have thought long and hard before getting the angle grinder out !!
Cheers – Will