Help with starter

JB, It sounds like it's time to pull the starter check that the bell housing and starter housing are making good contact (that's the ground) and check that your bolts are good and clean.   IF the connections are loose, you'll need to tighten them, but do a good job of cleaning them first.   The Solenoid is grounded to the starter, so make sure it's good and tight as well, and that the grounding surfaces are all clean.   If this doesn't solve the problem, I think you're due for a rebuild.   Take it out, run down to the alt/starter rebuild place, and check the price. sometimes a new starter is going to be cheaper than a rebuild.   Not sure on the solenoid removal, someone else will have to interpret that part for you.   BTW, you need to know the rotation of your engine if you purchase new, or if you get it rebuilt.   mark the starter with the direction of rotation, so there is no question when it comes back if it continues to rotate correctly.   good luck!