I have a 41 and use a 3/16 inch regular threaded screw to remove the pin-lock. The pin-lock was used from 40-54 so I assume all are threaded the same. Use a 13/16 socket to get the grease cup assembly off. The pin-lock is right behind it. Once you screw the screw into the pin-lock you can just take a pliers and wiggle the pin-lock out. Do try to seat the screw well into the pin-lock.
The cavity the pin-lock slips out of should be packed with grease and refilled every few years (3-5). Tightening down the screw inside the grease cup spreads the grease. So for a few years just tightening the screw lubricates the bushings holding the arms that support the pedals.
Good luck, Mike
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