Tony wrote:

The throttle was real stiff and my dad just wants to change it out. We
have an A&P to do work on the plane (he does lots of comanches)for
flying time and he said its no problem to change it, it take about 2
hours



Time to replace it, and vernier's the way to go. Stiff means the
strands of the cable are starting to break inside the cable housing,
rubbing and causing friction inside the housing. I had the same thing
happen to mine.