Heater Control Mechanism

I've only had my car (69 Barracuda) for a couple of months so I'm still finding the kinks. I think I'm gonna have to start lifting weights again to adjust my heater controls. It really takes a lot of effort to slide arms from left to right. Is this something that a little grease will take care of or should I plan on replacing the mechanism?
Also, I get no heat but that's another thread.....