To stop a toilet from rocking, start by gently tightening the nuts on the floor closet bolts on each side of the base, but take care not to overtighten them, as excessive torque can crack the ceramic porcelain. If the floor is uneven and a gap remains, slide plastic shims into the space between the bottom of the bowl and the floor to provide solid support. Trim the shims flush with a utility knife, and apply a smooth bead of silicone caulk around the base. Verification: Sit on the toilet or push against it to ensure it is completely stable and motionless.
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