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3. Bed parts replacement and maintenance
3.1 Casters disassembly and replacement
Use a 10-inch Allen wrench
to unscrew the screw, take out the screw, flat spring washer,
brake pedal, plastic retaining ring, hexagonal steel, etc., replace the spare caster, insert the bolt into
the base and the caster mounting hole, and tighten the nut.
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