Do you just need the plastic yellow paddle part? You're sure it's not a contacts issue?
Heh Duck,
I'm more than 100% sure its the paddle and not the switch.

As you can see the boss into which the securing screw is driven is broken off. This allows the paddle to move but it doesn't activate the internals. I could try to glue the boss back onto the paddle but it will just eventually break again because there's no glue strong enough to withstand the tension when the switch is deactivated (i.e. switching from hi to low). The switch internals are electrically perfect but the mechanics are stiff.
I could buy a full switchgear from Ebay but that's like US$100 for me up here in Canada. So searching for a used paddle in good condition.