(Also a Ron Power suggestion.) Removable brass pilots precisely center breech end of Chamfer Tool Extension Rod to eliminate any possibility of cutter runout. Do not interfere with cutting action or chip removal. Four sizes: .38 (.346"), .38-40 (.394"), .40/10mm (.388"), .41 (.398"), .44 (.416"), .45 (.442"), .475/.480 (.466"). Mfg: Brownells
