I am working on one at the moment myself. I bought a parts motor just in case as well. Let me know if you come up short on something or another.

I am just starting on WG4, serial no. 726497. It is frozen. I haven't ran it for 20 years. Does anyone know of a source for parts, like rings?
Thanks

Get rings here.
http://store.oldmercs.com/category_s/85.htm