Thanks everyone.
I'll check out the books and maybe I'll find some. I also like the comb idea for a couple of reasons - the spacing will be even, and I can get several combs (I'll have to go get some because I have not needed a comb for many years! ) and remove the teeth at varying spaces.
I will be traveling to Cincinnati next week to visit the Tr-State museum. I did some research and found that they are restoring and FG-1D and will let me photo and video it. It's not 'together' and parts are missing but hopefully I'll be able to get a lot of pics.

Thanks again!