Was gonna thread it for a mip x John guest fitting. With 1/4 tubing. The ID of 1/4 tubing is 0.17 compared to the 3/16" 0.1875 ID. Maybe get a little more restrictionThat is(was) a shank with built in john guest fitting. The brass is not threaded in, it is pressed in. Your best bet for getting it out is a drill press.
If you want to use that as a standard shank you may want to grind smooth the rear seat where your washer is gonna go.
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