Here's a nice video comparing the two types. Maybe I've been using my Harrison wrong as the video shows it around the front of the camera and not around the rear standard as I use. Also, I have asymmetrical adjustments with the rear standard which may make it more difficult to use in the back. I'll have to try the video's method.
https://www.youtube.com/watch?v=vbEsE06g0oM
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