I have a couple of CVA cap lock pistol barrels that I would like to use to build flintlock pistols with and was wondering if there is any touch hole liners that will fit the threads and sized to simply screw into the drum opening in the barrel? I can cut the barrels off, drill and rethread for a new breach plug, and then install the touchhole liner of my choice, but it's a lot of work and would require shortening the barrels some.