The X-18 iron uses a .370 shaft. Because the hosel tapers down slits need to be made in the tip end of the shaft. You don't need to make 6 slits, 4 will work fine. Cut 4 - 3/4" long slits 90 degrees apart. You can easily eyeball this so a jig is not needed.Reshafting a set of Cally X-18s. Need a cutting guide or jig to make the 6 slits in the new shaft tip to do the proper install. Anyone know where I can buy, or fashion one?