I tried the quick release trick. It's been so worn that it still won't stay in the slots and just bends the QR, which is luckily easily straightened. This thing is done like dinner, not even going to bother. Now when you guys say soak in oil... what part? Around the cassette? Because I don't see anywhere inside that oil would go, just grease for the bearings.
I should've left it alone and just rode it until it seized lol. Gonna squeeze some grease in and put it back together and call it a restorations At least I got all the grease off the drive train. Who greases a chain? Honestly!