Well, my starter has departed. I took it to a local auto electric shop for a rebuild and upon disassembly, they found that the armature shaft had snapped at the starter drive retaining pin hole.
Apparently, there was a crack there from way back as a close examination showed that part of the break was blackened. Funny thing was, the thing would actually work intermittently. It seems that the drive would hit the flywheel and cause enough pressure to force the pieces together enough to occasionally turn the engine over.
Oh well. I took my other dead starter in today to try to combine the two to make one.
I'll post a picture of the damage soon.