The PV shaft is "half moon shaped", and fit in a coresponding half moon in the
bracket that is held in place by the allen screw.
Undo the screw and look carefully and you will see what I mean.
Turn the PV shaft and poke a finger in the exhaust port so you will feel when the PV is closed, that will be the position you are looking for.
NOTICE, the PV shaft can rotat as many turns as you want, and during a 360 deg turn there will be two closed points. Only one is the correct one when the half moon cut out line up with the PV acuator bracket/washer.
I did this myself two day ago, hope this helps.
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