sounds like you got oil on the friction disc-allowing it to slip even under spring pressure- if you are rebuilding it you should replace the friction disc, so no reason not to get the friction disc completely oiled up. then you should be able to turn the pressure plate independent of the pulley and realign the holes with the set screws- there should be two in each hole- one as a "lock" and one as a setscrew holding the pulley to the shaft
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