Solution:
MicroCentric produced an air chuck with "pull-down" clamping action, complete with special top jaws and part locators. The chuck used our QC jaw system, and was supplied with hardened top jaws which use interchangeable gear pins to contact the gear's tooth form. The system produced concentric location of the gear relative to its' pitch diameter.
Achieved accuracy: 0,005 mm (incl. changeover)