Grant Erwin wrote:

I've heard these called "Johnson bars".

This is what we called "Johnson Bars"

http://www.gilmorekramer.com/more_in..._dollies.shtml

I once asked a grizzled old rigger why they were called "Johnson bars",
he replied"Cuz if ya slip when you're using one, it jump right up and
slaps ya in your Johnson". He then added, " The name Johnson bar sounds
a whole lot better than "Nut Crusher".

I had to agree.