When I could not find it locally, I bought blotter paper from
Amazon.com for making the circular rings that go onto the top of
a Coinola valve seat.  I bought from two different vendors and both
were about the same quality paper.

I cut the rings with dies I had made by Ellison.  I also had them
make my dies for cutting Coinola gaskets as well as several other
dies.  See http://www.ellison.com/corp_northamerica?tp=c 

Don Teach - Shreveport Music Co.
Shreveport, Louisiana