Has anybody ever tried to lube the 3 control cables that connect from the heater controls to the heater box? How about the heater controls? Not sure if this was done when manufactured or if I should even bother to do it and how it should be done. Is this even necessary? I have the heater box out for restoration. I have not taken out the heater control assembly and cables yet but with the heater box out the temp control is not operating smoothly. Seems like it is binding but the cable looks ok. The other controls operate "just ok" (fan switch is fine). Smoother operation would be great. I did a search and didn't find anything. Thoughts?