Michell Engineering Turntable Sweep Arm Wrist Dart Variations

This was first pointed out to me by Gino and I wanted to share it with you. There are at least two variations of the "wrist dart" that is a part of the Michell Engineering Turntable Sweep Arm. The typical dart (which seems to be much more common) has a short shank and a more squat dart head which the atypical (only know of two of them at the moment) dart has a longer shank and a much longer dart head. Just thought you might want to know!

and which one is "correct"?

To the best of my knowledge, the "typical" seems more accurate... but honestly it is hard to say.

Do we have any idea if the longer one was just sunk into the Gauntlet further?