sadness abounds, and here is the proof.
yi9-g
so, at first all is well, although a lot of "pot" movement before anything happens. When the first fuse blows, the motor emitted a big spark at brushes end. I did note when running, it was like having a small misfire in an engine, it wasn't real smooth. It was noisier than before, however the belt was slack, and I don't know if it was on the correct pullies at this time.
You can see what happens after that. I have put a 60w bulb on the output of the control board, its gone back to how it was prior to Johns repair (real sorry John, I wanted it to work as much for you as for me!). With pot turned off, bulb is very bright, turn up pot, brightness stays constant, John tested this and he has a proportional brightness with the pot.
So back to square one unfortunately, and I have probably blown Johns repair, however, I can solder John, and thanks to you sending the part back, could probably change it out again.
So peeps, I don't know what is the cause, change motor, its not motor and keeps blowing board, change board, and its the motor??? I stripped motor again, cant see any sinister goings on.
I am thinking change the thingy John did, and the pot? try again, hopefully the video will give up a clue, now where is the thrashing thing, this machine needs a dammed good John Cleese style thrash

PS..., Just watching video back again, when first turned on, you here the motor, but see its not turning, so no real slow drive, then up to 0.34 you can here the speed isn't exactly constant. For reference, when it first went bang last year, fuse just blew, I had slowed the motor down