Never had much to do with working with glass.
Nearest thing I had concerning glass was doing my time we had a huge circular inches thick piece of glass onto which the likes of flat valves which after machining would be lapped in.
Coarse, medium then fine.
Old fashioned way looking back and hard work but perfect flat faces achieved.
So I am no threat to a glass maker of fine engines.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.