DISASSEMBLED AGAIN
Because their was too much friction and sticking, I pulled everything apart to work on the parts. My first attempt using 409 did not remove enough of the deposits to allow free and easy movement of the parts. There was also a shaft around which the cam roller and levers turn in order to move the card shifter left and right, but it was barely turning because of sludge inside.
PUT RUSTED/CORRODED PARTS IN CONCENTRATED VINEGAR AND SCRUBBED
All the parts that were interfering with smooth movement due to layers of rust or corrosion were soaked in a 30% vinegar bath for hours to loosen up and dissolve what it could. I used a sanding block to break away the surface coatings. I was able to reduce the irregularities in the surfaces far enough to allow the parts to move smoothly.
APPLIED PASTE WAX TO REDUCE FRICTION IN CARD SHOE AND ROD
After the rust and other dirt was removed from the rod, it still had some rough surfaces because of corrosion pitting. I used an automotive type paste wax to reduce friction on the rod. I had cleaned out the hole in the shoe as well.
In addition, the surfaces that the shoe glides upon - the side plates in the reader plus the top of the shoe - were waxed to give it less friction. The result was an acceptably free card holder sliding to the right under spring tension but giving way to the left as cards are added to the stack.
GREASED THE SHAFT ACTIVATING THE CARD SHIFTER
The shaft with the cam roller and levers pivoting on it needed a bit of grease applied in order to have the parts rotate easily on the shaft. This is far enough down that there is no risk of the grease contacting any cards, thus it was safe to lubricate here.
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