I have at last got hold of what I hope is a good motor to replace the defunct motor on my ML7 Myford.
The lable says it is a Brook/Crompton "Invensys" 3/4HP single phase I have seen a video of it running. It sounded quiet and it looks in good order. It has resilient mountings and I'm told it dated from 1994.
I have rewired the lathe with an NVR switch, to use the Dewhurst switch only for switching to reverse when the power is not connected, and now all I have to do is connect the Dewhurst to the motor.
The problem I am now faced with is that although the wires coming from the windings seem to match those I have seen in a guide to connecting a Brook crompton I found on line, but the markings on the connections board are very different. They are from left to rightZ2, R, S, U1 & U2 and P (which is unused.
So I'm hoping somebody has a similar motor or is familiar with it. The bare wire links between U1 & S and between U2 & R are somthing that puzzle me.
