Atari Joystick Models

[hbomb]

I have been trying to fix one of my Heavy Sixer Joysticks, and was talking to the guy at Best Electronics. I mentioned that I had a CX-10 joystick that I was trying to find some replacement parts for. He stated that in his 22+ years dealing with Atari parts, he had never heard of a CX-10 joystick, and that all Atari joysticks since day one were CX-40's, only modified over the life of the console.

 

I'm a little confused as to which is what. Now I did stick a CX-10 PCB into a CX-40 joystick and it worked. However, it doesn't work the other way around unfortunately.

 

Can anyone shed some light on what this guy was talking about at Best?