I was taught to take a voltmeter and test for voltage at each connection between the battery and the starter, including testing the ground side of the circuit. Voltage difference should not change between the battery and the starter; if it does, you've got a dirty connection or a bad wire.
Even if you didn't have chipped ring gear (gear on the flywheel) teeth to start off, you may by now with all that grinding away - I don't know how easy it is to observe them, but I suppose you can remove the starter to inspect them if you don't have any other way to do it. That seems unlikely to have been the original problem, though.
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