[Elecraft] help in hooking up my straight Key

[Paul Gates, KD3JF]

I am on my way to the District <Wash. DC> to see the model
train display at Union Station before they take it down and
when I get back I want to be ready for SKN this evening. I
have my key ready to go i thought but can't figure how to
configure the plug into the radio <Icom 706, Elecraft K1,
KX1.> I would like to use the 706 to begin with.
 
I figure I must use a stereo plug. I figure in using a 2
wire cable  from my straight key into the stero plug that
one of the contacts in the plug is not used?? Any way I
tried a mono plug into the 706 and could not get it to
work.
 
Hope to have a message from somebody this afternoon when i
get back..... Had a fabulous vacation in Columbus for
Christmas and flew home yesterday. Thanks in advance.
 
Hope to work some of you on SKN.
 
Paul Gates, KD3JF