Opinions on this........

[jaybird]

Originally Posted by waltjp

Back up whistle - Obvious, used to signal those behind you when you're about to back up.

... which is activated by escaping exhaust triggered by reverse action leg motion!

[Welpe]

Originally Posted by jaybird

... which is activated by escaping exhaust triggered by reverse action leg motion!

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.