Quote:
Originally Posted by jaybird
... which is activated by escaping exhaust triggered by reverse action leg motion! 
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You have to either be an umpire or have been an umpire at one time to utilize this technique.
Brandon, when I work HL, I use flourescent colored zip ties for two reasons, one is to mark the half way point on the chains (tape also works) and another is in case the chains break. I mark the half way point on the chains so I can quickly tell if a foul such as encroachment by the defense will result in a first down or not.