Tri-Flow, a silicon based teflon lube that doesn't dry out like most.
Clear, spray can but also comes in an eye dropper type.
Mucking around it seems that the disc keeper, or top flap that pushes the disc down onto the spindle when the tray closes has some play, if it drifts to the left it skips, to the right it is fine.
Light pressure beyond what the spring exerts is also fine.
The floating disc at the end of the keeper rides on a single ball bearing point,
but I cannot see why it has this alignment issue.
I shimmed it behind one pivot and in front of the other and it seems happy.
only thing I can think of is that the single point ball bearing has worn the plastic retaining plate and lost its ability to "wander"
I see a microscopic depression where it rides but it seems crazy that would be the problem.
Unit never dropped, smacked or abused so I don't see how anything is out of whack from damage.