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Align the grab bar's mounting flanges with the newly installed wall anchors and any direct-to-stud connections. Insert the appropriate screws (typically provided with the grab bar or anchors) through the holes in the grab bar's flanges and into the anchors/studs. Hand-tighten all screws initially to ensure proper alignment, then gradually tighten them firmly using a screwdriver or a drill with a torque setting. Avoid over-tightening, which can strip screws or damage the wall or anchors.