I had a conversation with a machinist last weekend, he and his wife are godparents to my new grandson Grayson and were attending the christening. Not surprisingly, I had taught him and we got to talking about these hauben and how the spikes were spun on a lathe. He told me they would have spun a brass rod and made the cone from that. He also pointed out that because these were all made by hand there would be differences despite regulations and micrometer measurements. He reminded me that there could have been 2 shifts of men working the same lathe in a 24 hr period. He told me about his apprenticeship to a British old school machinist who first assigned him the task of sharpening drill bits. He would finish a drill bit and have it inspected by the master craftsman.....who would look at it and tell him to do it over. He had to master the simple task of sharpening a bit before he could ever get near the lathe.