Turning Up A Storm
Like a set of Matroshka dolls, jigger set up is a series of nesting forms, each smaller than the previous. The set up requires a model to be turned along with a prototype jigger mold based directly off your form. The outer husk serves as the mother mold to reproduce the jigger molds. This middle piece is inserted into the jigger base and rotates as form the inside form with a profile arm.
Here's a brief video to show the process of some jiggering in action