Occasionally, the spring on an auto-retracting tape measure, will become a bit sprung or stretched so that the tape will not fully retract into the case on it's own.
Well, no more trying to stuff it back in (this only makes matters worse anyways) there is a solution, especially if the case is held together with screws, like my Illinois Industrial Tool (IIT) tape.
Step 1: Assess how to disassemble
Mine had 3 screws to remove.
The one holding the clip in, also held the center spring in place.
A careful examination revealed that there were only 3 screws in the back of the case.