It is useful when you have got to bend or make wave-shaped bangles or earrings that has already been coiled.
The deformation given can not modify internal size of bangles or earrings, so here you find a inner part that keeps the tube in correct dimensions. This part goes up and down in the tooling run, so that the piece can be easily removed when the work is done. There is also a registering screw inside to regulate the hight of the piece you need to obtain.
WHERE TO USE IT
In every kind of press, there is no need of particular pression.
No maintenance is needed: make sure that spare parts are always clean, to avoid their surface damage.