Also, SOME of these have (sometimes tricky) release for "if you screw up." That is, once you get the rachet going, it will not open until you squeeze them clear down. But if "something happens" as in, you inserted the terminal wrong, it got out of place and "caught" crooked, or bent/ damaged the terminal, look around at the tool carefully. Sometimes "down in" the works is the ratchet and or a small tab that you can release with a finger or a small screwdriver to abort the crimp
SOMEWHERE there should be a guide chart that shoes what terminals fit what dies
