Micrometer Head to Speed Gaging

A special gage equipped with this Starrett No. 204 Quick Adjusting Micrometer Head greatly increases the speed with which measurements can be taken.

Pressing a button on the thimble allows the spindle to slide along its axis to any position within its range.

Releasing the button re-engages the spindle threads, and thimble rotation is then used for final size adjustment.