I hate not being able to find something that I'm certain I've seen.
Searching
123,
1-2-3 and
1*2*3 turned up zero posts so I had to try another tack.
Anyway, I have now attached the pictures I was talking about.
They were first posted by
Richard at Playmoboard in 2004.
The first shot is a custom where he put a 1-2-3 head on the body of a normal klicky. I believe he had to trim a bit of the head pin in order to get them to fit together.
The second is the exploded view showing all the inner workings of a 1-2-3 figure.