The device inside the spring barrel that holds the outer end of the mainspring in place. The inner end is attached to the arbor hook, the outer to the barrel hook.

The drum-shaped metal housing which contains the mainspring in a clockwork-powered mechanism. In cylinder musical boxes it is usually of brass, while in disc-playing musical boxes it is frequently of stamped steel or cast iron.

A note having very short duration.

See pneumatic

In a disc music box, an intervening star-shaped wheel that is turned by a projection on the disc and which, in turn, plucks a tooth on the musical comb or combs.