Pool players should maybe use a compound taper; one that quickly increases to a long pool taper. I've not got around to this but I think tapering the ferrule alone would at least get the tip size into spec. One of my shafts has a 12mm ElkM sized down with the fiber pads alone from a 13 mm ferrule. The tip hits like a 12 (whatever that means) and the stick strokes like a 13 - both of which they are lol...