Follow up: did some research into the noisy drive in playback mode problem. Source indicated that the Capstan Flywheel rubber wears down and/or becomes hard and this causes the noise at the friction drive point. The capstan drive torque does seem very weak. I guess I will keep checking eBay for one of these capstan units. Strange as it sounds, after cleaning and after a light sanding the play button will stay down if pressed carefully. The pause button appears to pause play mode but not record mode for some reason (more research needed). Still haven't a clue where the broken spring peice came from.