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After all pilot holes are drilled and confirmed to be in studs, prepare the grab bar by aligning the screws through its mounting plates. Use an impact driver to begin fastening the grab bar. Start by inserting one screw into a top hole, driving it just enough to hold the grab bar in place but allowing for minor adjustments. Use the level again to confirm the grab bar's alignment before fully tightening any screws. Once level, proceed to drive all remaining screws securely into the wall studs using the impact driver. Once all screws are tightened, remove the painter's tape from the flange covers and snap them into position over the mounting plates to conceal the hardware. Confirm the grab bar is firmly installed by applying pressure, ensuring it does not move. The presenter emphasizes that installing into solid studs makes the grab bar extremely secure.