If your chair is too heavy to turn upside down on your own, recruit a friend to help you do it.
Use a spray oil like WD-40, which costs around $10 (£7. 10) at a hardware store. Try gripping it with a towel or glove if it doesn’t budge. Some office chairs will have a swivel plate (a square plate that attaches to the chair leg) instead of a stem, though this is unusual. If this is the case, simply use a screwdriver to remove the plate.
The pry bar’s nail-pulling slot should be big enough to fit the stem of the caster, which is usually a little over 1⁄2 in (13 mm).
If the caster won’t move, try rotating it around the caster. Different angles may give you more leverage to pull the caster out.
If you have another person with you, try getting them to pull the office chair from the other side.
A threaded caster has a screw that screws into the chair, while a grip stem pulls out like a plug from a socket. If your chair has a swivel plate, measure the width of the plate itself.
If you’ve had difficulty rolling the chair around (say, onto an elevated surface like a rug), consider buying a larger wheel.
Twin-wheel casters are more often used in office settings, while single-wheel casters are typically found in industrial settings.
If your chair will be rolling on both carpeted and hardwood floors, it’s best to get hard floor casters, as they’re less damaging to hard surfaces.
Hard floor casters are also able to roll on carpets; they’re just made to save hard floors from damage.
If you’re shopping for your casters in-person, take one of the old casters with you and ask someone who works there to help you compare.
If the caster is hard to get into the hole, add some lubricant (like WD-40) to the inside of the leg or use a rubber mallet to drive the caster in.
