I made this head button for my GPH 346. It is one of the FIRST parts I made using my rotary table incorporated with the lathe and mill.
It was made before CNC and to this day it is one of my most cherished parts! Making the countersunk hole for the bolt was the hardest thing to do. They told me that machining was hard but finding out ways to hold the part is MUCH harder! I now believe it!
The button is about 1.5mm thick and took me 10 hours + to figure out how to make !