A ring gear of a planetary reduction gear is screwed into an inner peripheral surface of a first housing through an opening thereof, while the thrust receiving flange of a screw feed mechanism is held by {HEAD ~ the locknut} screwed into an inner peripheral surface of a second housing through {TAIL ~ an opening} thereof 
screwed through
A ring gear of a planetary reduction gear is screwed into an inner peripheral surface of a first housing through an opening thereof , while the thrust receiving flange of a screw feed mechanism is held by { HEAD ~ the locknut } screwed into an inner peripheral surface of a second housing through { TAIL ~ an opening } thereof
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