I completely agree with armorer951; you don't want to increase end play.

You want to increase bar/cyl gap. File then stone the end of the barrel carefully, keeping it square. Check often by closing cyl and checking light space for squareness.

To easy to do and not worth the cost of a cutter. You'll get it at least as good as the factory which do not always get it square.

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Jim
S&WCA #819