US Patent 7712377 Dimple test for detecting improperly inserted hose

In a crimped hose, a length of rubber tubing is crimped into a blind-ended ferrule. To determine whether the tubing has been fully inserted, a dimple is pressed into the ferrule. The force needed to produce the dimple is small or large, depending whether the rubber is inserted properly, and the difference is large enough to serve as a detector. Measuring the dimple-force provides a commercially-useful test for proper insertion.