Northfield Precision Instrument Corporation has designed a special internal grip collet chuck for balancing drive shafts. The collet on this chuck is ground to grip the pitch diameter of the splined C.V. joints of a drive shaft assembly. The “cone” has three stop pads for axial location. Tapped holes on the O.D. are used to balance the chuck assembly prior to production. This chuck repeats to less than .0002in. T.I.R.