G: The word you're probably looking for is gas lift cylinder or just chair cylinder—the metal post that connects the seat to the wheeled base.

Easiest way to remove it (safely and with minimal tools):

Tools needed:

• Rubber mallet or regular hammer
• Pipe wrench or adjustable wrench
• Penetrating oil (like WD-40), optional but helpful

Step-by-step:

1. Flip the chair upside down.
Put it on a soft surface to avoid damage.

2. Remove the base (the wheel part).

• Hold the base and give the bottom of the cylinder a few firm whacks with a rubber mallet or hammer (use a block of wood if using a metal hammer).
• It’s just pressure-fit—no screws—so eventually it will pop out.

3. Remove the cylinder from the seat mechanism.

• Spray penetrating oil around the top connection where the cylinder enters the seat plate.
• Clamp a pipe wrench tightly around the cylinder and twist it back and forth.
• You can also hit the side of the wrench or tap the cylinder from underneath if accessible.

Notes:

• Replacement cylinders are cheap and come in standard sizes.
• Be sure to measure the length (fully extended and compressed) and diameter to match it.

Let me know if you want help sourcing a compatible replacement or diagramming the process.

G: Glad that helped! If you need any more details or run into any trouble with the replacement, just let me know.

G: Yes—exactly. The gas lift cylinder is friction-fit (press-fit) into both the seat plate and the wheeled base. There are no screws—just pressure and sometimes a bit of rust or grime holding it in place.

You’re essentially:

1. Wiggling and twisting to break that seal.
2. Tapping or hammering (safely) to force it loose.
3. Possibly using penetrating oil if it’s really stuck.

It can feel stubborn, but once it breaks free, it usually comes out cleanly. Keep at it—you’re on the right track.