Starter Problem

51, I had the same problem once. I had not run the top bolt all the way in which caused the starter to be at a slight angle. My bottom bolt was flush because it was the easier bolt to get to. I ran my hand up to the top bolt ear on the starter and felt a gap between the starter and the bell housing. I had to loosen both bolts a bit so I could wiggle the starter and then it slid in properly. It started easily with no grinding sound. FYI