starter problem

[Plunkett]

Just the other day I ran into a problem where my truck didn't want to start. I read on a few threads on the site about people having problems with the ignition switch, nuetral safety switch, and the fuseable links. I haven't had time to do any test on the truck to check the voltage yet. The problem is that I can try and start it every so often and it won't do anything; however, I can hear a slight click sound coming from the area where the starter is. I have found that if I get out and hit the bottom of the starter with a hammer that the truck will fire right up. Does this sound like just a starter that's going bad or should I focus on looking in other areas too before replacing the starter?