Hi Rich, I dunno?? I just know it takes a lot to push something bigger thru something smaller...
.... most of my experiences ended with stuck like welded results! I though one might mount a threaded fixture in a large, mostly linier thrust bearing, and let it, the barrel, turn as the button goes thru!
..... I have been eyeing the button for sale on ebay.... Project number 9999! .... best to all,til...lat'r....GT....
