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Once the grab bar is fully installed and all screws are tightened, it is crucial to perform a rigorous safety test. Grasp the grab bar firmly and apply significant downward, outward, and inward pressure, simulating the weight and force a user might exert. The grab bar should feel absolutely solid, with no movement, wobbling, or any audible cracking sounds from the wall or anchors. Any sign of instability indicates improper installation and necessitates immediate re-evaluation and correction. If unsure, consult a certified professional.