Conical handle
Black phenolic plastic.
Tapped blind hole.
Ogival handle
Zinc plated steel insert and tapped blind hole.
Ball knob
Red phenolic plastic.
Equatorial groove. Tapped blind hole.
Equatorial groove. Brass insert and tapped blind hole.
Equatorial groove. Self-locking nylon insert.
Equatorial groove. Smooth hole.
Threaded zinc plated steel revolving stud with hexagonal locking socket.
Push-pull knob