Corbin and Russwin Master Ring resources
So far I've poured through the Corbin Russwin cylinder manual, Robert Sieveking's The Locksmith Guide to Interchangeable Core Cylinder Service which has a good chapter on it, and Rich Howard's lengthy youtube video and document. I know Gerry Finch wrote a book in 1990 in his series on IC systems entitled Book 3: Servicing Interchangeable Cores and Master Ring Cylinders, but it seems impossible to find nowadays. I'd love to get a copy of that.
Unfortunately, a Master Ring system isn't something you run into every day. But I have some cylinders here, a PK-1070 pinning kit, and of course can cut the keys. So books and the internet it is. If anybody has additional recommendations I would appreciate hearing them. Thanks!