from the pic. 5 it looks like the.. cam? is the grinded metal on the left side slightly off the body - on the pic. 4 the rightest arrow points on it. i think this piece of metal should be turned in a such way that the two rollers (middle arrow or somewhere around) will move that piece of metal. well - in case it is actually connected to the lens mount.
try looking at focomat 2c or 1c - the AF system should bear at least minor similarites.