Thank you gentleman - I really appreciate the quick response here. I haven't had much time lately to revisit this. Through a recent attempt I actually made it worse, which was the perfect confirmation needed to confirm your suspicion. There was a cable binding the physical movement of the tone arm, which was one of the cables I had altered to install the new motor. I bound and tied those down better, and we seem to be back in business! (*knock on wood)
Another question - I do think I have a short or grounding issue as very minor bumps to the player or entertainment center holding it give quick feedback "spikes" through the speaker (even if a record isn't playing). I suspect it may be because 2 of the bulbs are out. Any idea where I can get new bulbs for the 45/Stop/33 buttons?
I searched online before and tried some from Amazon but they did not work (though they were the right size).
Thanks again