Mark, I cant be 100% sure but I am pretty sure the base is an electrolux (It came branded as Flymo (white/ silver base) and Weedeater I believe. Their might be others which I havent seen before.

As always keep your photo's and comments coming. I do like your threads.

I have included a photo of a weedeater model I recently bought back to life to explain what type of base I think yours is.. I love the older briggs engines.

[Linked Image]

Happy to be corrected if Im wrong.

pete