Ok Here is a pic of my neck joint disassembled
The Black strip is 3mmx1mm CF as a bearing strip
The hole in the neck block has a threaded insert installed from the inside.
The bolt is installed from the outside into an enlarged spotfaced hole and doubles as a strap button.
I had to trim a little on the heel face for adjustment range so it is a little rough (shows it is handmade right...)
