Here is the one I made last year from Fred's drawing and pictures. It works well. Use finesse not force. I used mini screwdrivers, picks, air pressure and a very powerful mini magnet. When you retighten the screw in the cam ladder torque to only 10 newton meters.
The screwdriver tool was another guys idea. It helps to do the job too, but you have to be really strong and need 2 people to use it.
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