Ole Dog said
Are you talking about a bare cylinder or one purchased on eBay that has been part of another gun? I suspect you are a S&W specialist. Most Gunsmiths that work mostly on Smiths don't have a clue about DWs. DWs are basically modular. Even though the star and hand are supposedly factory fitted parts, since most parts are MIM and identical a used hand and star will usually work and time properly. Ditto "fitting" a cylinder. Yes, changes were made in the gas rings over the years. I doubt the factory has any more blue parts. The best course would be to find the right cylinder assembly on eBay. 

  

A used replacement cylinder was bought from Jack First. The gas ring is shorter than needed. I am a Gunsmith and there’s nothing mysterious about the DW. My proposed solution is a shim/shims placed in the cylinder similar to what would be done on a S&W. Sparatic emails from DW seem to infer shiming “isn’t how they do it”. I’ve contemplated this for many days and haven’t come up with any reason it’s not a viable and safe solution. I’m looking for the member that worked for both DW and S&W out of an abundance of caution to hear any objection. The gun times and locks up perfect with the cylinder in the correct position. 

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