Bolts are correctly torqued to maintain the friction. The shear force only becomes relevant when the bolts are not torqued. Either the bolt head or the nut can be torqued. Fasteners should only be torqued if they are fitted in clearance holes. Seat are usually screwed in or torqued . The arm extended toward the black hole will be torqued spinward. Likewise the arm extended away from the black hole will be torqued anti-spinward. The arm extended away from the black hole will be torqued anti-spinward.