I’ve got some older dynalite shafts that are dimpled at the tip. They are very difficult to install ferrules on, and a standard 370 OD head is very, very tight. I have cleaned the hosels completely. You almost have to screw the heads onto these dimpled shafts. Don’t even ask about ferrules!!   What gives with these dimpled shafts. Only seen them on a few sets of shafts.