yes,about one week to wait for shipment,will probably do it at the beginning of september.
Will do same process,I mean creating the missing slope on back of the "big" diameter,and create the groove inside.
Would you have some bead sanding on yours?
Please notify the machining on the top won't bring some use patina near the holes section,but it's possible to keep the black color on the back internal tube.
I can either sand the internal,where the cone will go,to make a easier assembly,and keep only blackish color on the external diameter of the internal tube.