F1 moving his glove to give the signals again

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rule 6.1.2 situation d: F1, while on the pitchers plate in either the windup or set position, a) adjusts his cap or b) shakes off the signal with his glove, or c) shakes off the signal with his head. Ruling In a) and b) this is an illegal pitch or a balk if there are runners on base. THese are movements of the arms or legs not associated with the pitch, in c) this is legal.
Fed.