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T Yes, there are indents in the plenum the grubs screws seat in. If you remove the screw and rotate the plenum you can see them go by.
T I did and it was still loose. Huben replied and said my clocking was off therefore the set screw was not seated correctly.
T Just installed the huben power regulator on my zelos .25....it's screwed in all the way but it's slightly loose with slight side to side...