Here is from the 2008 edition for the G4003G gunsmith lathe. I think this is the switch you have.
I also attached the Shop fox version of the lathe. Probably the same wiring, but you never know. I can't find the older version of the 4003, I'll keep looking.
Have you checked with Grizzly, to see if the switch is still available? It may be cheesey, but it did last a good bit. Would be nice to have the saddle lever for stops, and starts.
View attachment 281066View attachment 281067
That is Grizzlys version II. There own design drum switch (mine is a Dayton, made in USA drum switch, steel and bakelite) Grizzly discontinued my original switches, then they discontinued your chinese drum switch and now they have 2 limit switches. Nothing comes even close to interchanging. They will sell ya the stuff and you have to fab all the parts to make it work. Not worth my time. This switch is beginnning to show signs of "it's gonna work" !!!!