A question for the machinists on thread compatibility. I have a 9/16-32NS tap which I use to clean up the threads on gas cyls. The Kuhnhausen Shop Manual indicates that gas cyl threads are 9/16-32 NS3B mod, major dia .5625; minor dia .532+.003. Thread sizes on the lock screws are shown to be 9/16-32 NS, major dia .5625 min; minor dia .5287+ .0034.

As I read it I should be OK to use my 9/16 -32NS tap to clean up the threads on several lock screws which either won't fit or which bind part way thru installation. Can someone confirm this pls.
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