Dear Martin, I was lucky I have a secondhand relay, why my motor was overheating is because the relay contact was dancing up and down rather than making a clean contact. Personally I don't think you'll have any luck sorting a relay or a moor. You can get a replacement motor from Cowells but you will have to do a lot of modifications as the motor is bigger you would would have to raise the base and change pulleys and it would probably outweigh the value of the lather. I am not an electrician I am a motor mechanic but what you could try (totally at your own risk) with the lathe completely disconnected from the mains, if your lathe has the large cream belt cover loosen the two screws at the back of the lathe and carefully remove the cover turn the lathe upside down, there is a plate with four screws, remove the screws, you will see the black relay with three wires connected to it, near the single red wire from the motor there is a small screw and a plate, remove the screw you will be able then to lift the relay off it will leave the T section in the base, lift the relay and carefully lift the black box you will the contacts near the coil, as long as the coil is alright its a possibility the points can be dirty, if you get some very fine 800 wet and dry paper fold it in half so both sides are abbrassive slide it between the points carefully push the top point down gently so it has slight pressure on the paper and gently move it forward and back, but don't damage the metal section. After you have done this get some clean paper with the same method rub it between the points to remove any residue, similar to what you would do on an old cars distributor.then FULLY assemble and then try it again. If this doesn't work it would pay to un-solder the motor and get a competent electric motor repairer to test it. Hope this helps, best wishes, Chris.