Patent ID: 7363721

Claim:
A gauge for measuring a feature of a hole countersink formed in a workpiece, comprising: a tube; a displaceable shaft disposed within the tube; a feature measurement indicator coupled with one end of the shaft for indicating a feature measurement reading based on the displacement of the shaft; a probe for engaging walls of the countersink, wherein the probe includes a spherical member having a diameter less than the diameter of the tube, and a shank fixed to the spherical member and axially aliqned with the shaft; and, a flexible coupling between the other end of the shaft and the probe, the flexible coupling allowing the probe to move laterally in a radial direction relative to the shaft upon engagement with the countersink walls, wherein the flexible coupling includes a coil spring having first and second open ends, the shaft and the shank being respectively received in tight frictional engagement within the open ends of the spring.