lockwork
/ˈlɒkˌwɜːrk/Definitions
1. noun
work requiring skill and patience, especially in intricate mechanisms or decorative metalwork
“The intricate lockwork on the antique clock was a testament to the craftsman’s skill.”
2. noun
a system of interlocking parts, especially in a mechanism or machine
“The old clock’s lockwork was complex and difficult to repair.”