Seiko Group OFL-12 SERIES - Manual (Page 15)

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11) Weight arm
Provides the correct polishing pressure to the ferrule tips. There are three
setting positions for the weight on each arm.
12) Thrust pin
Applies the polishing pressure to the center of the holding jig so that a high
level of polishing can be obtained.
13) Rotation stop pin
Keeps the holding jig from rotating while the polishing disk is rotating.