Help please advice needed.
I have a lovely little Cowells 90 ME watchmakers lathe, built late 80s, it runs beautifully but the switch arrangement leaves a lot to be desired being currently just a 3 way toggle switch, centre = off, down = forward, up = reverse so if the switch is in any of the drive positions it will run as soon as it's plugged in also I'm always conscious that if the switch gets knocked it's not very safe. Apparently the NVR was an option and holes are there for 2 buttons but the cost for those plus a relay from Cowells is currently upwards of £90 total.
I decided a simple NVR would suffice and thought I would be able to just fit this and break into the incoming 240 volt supply feed, will that work or am I being naive?, Also I'm not 100% certain of the NVR switch contacts though I know the principle so not sure which of the contacts are live and neutral though I haven't had a multimeter on anything yet. The pic of the NVR switch wiring diagram is off the internet and not exactly the same model and my contacts are numbered 1 to 4. Lathe motor is low wattage.
I've tried to draw out a diagram of the existing wiring as best I can, hope it's comprehensible, all wiring colours apart from incoming 240v supply and motor wires are brown. I've drawn it as if looking from the front rather than the back and have assumed the unit with 3 connections is a start capacitor?