How did you go with the replacement swap out? I bought one off ebay that doesn't read disks and didn't have grease applied to the gears so I doubt its ever been set properly at all.

Heres a couple of guides on making the adjustments.

BTW, those first generation PS1 consoles are known for having good 'warm' vinyl like CDDA audio, so worth repairing if you're an audiophile.