Is that different than the standard bencher?  With the standard bencher, the 
paddle rests on the center post for the spring, and the two keying contact 
posts.  It balances and works in a pinch.  Field day for example.  For long 
term, reverse the wires, and change the paddle settings in your other 
radios.
I actually found the idea on this list, didn't believe it but it was rather 
easy to try, and it works.