[Elecraft] KXPA100 connections

[Rick Dettinger]

Guess what? I need assistance!
I am attempting to connect my KX3 to my new KXPA100, and am stumped with the Key Line Cable shown on page 8.
This is a doubled ended RCA plug type cable.  It references fig 5 on pg 18 for the basic installation, (no KXPACBL).
Paragraph 6, pg 19, seems to say that the Key Line Cable goes to ACC2 on the KX3.  Great, except the RCA plug does not  come close to fitting the 3.5 mm ACC2 jack.  What am I doing wrong? 

73,
Rick Dettinger  K7MW