The trail mirror chop mechanic (front court, three man only) was instituted a year or two ago. Someone should be along soon with a page reference in the Officials Manual. I think I saw a reference in an earlier thread.
I believe the reasoning was to make it more visible to the timekeeper for starting the clock.
Personally, I'm not sure it's really necessary but I try to comply. A lot of veterans I know tend to ignore it.
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Calling it both ways...since 1999
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