Rebuilding a backup distributor, for my 53' Merc

[Merc Cruzer]

I read through this old post, great information. I am rebuilding a back up distributor. (if you have one you will never need it!. I now have the old bushings out and everything is now soaking, to get them clean before I start the installation of the new bushing, and the reassembly:

https://www.fordbarn.com/forum/showt...ng+distributor

My question is what do you use for the material to replace the paper on the bottom of the distributor?