Michael,

It is difficult to get onto the pivot pin hole to remove the rust from there without un-pinning

I have had the most success with in situ rust removal in the pivot area using penetrating oil (I used Kano Kroil).

Flood the pivot area, and 'excercise' by opening and closing razor; re-apply oil & repeat as many time as you need. Finally flush the pivot area with lighter fluid to remove the excess penetrating oil. You could then lube the pivot with mineral oil. Please take care to avoid excessive exposure of the scales to the solvents !

Have fun !

Best regards

Russ