How to Remove Screws Under an Office Chair

The method for removing screws under an office chair should be selected based on the screw's condition and the base structure. Here are the specific steps:

I. Removal Methods for Tight Screws

If the screws are stuck due to rust, deformation, or over-tightening, try the following non-destructive methods first:

1. Rubber Band Assistance Method Lay a stretchy rubber band flat over the screw head, ensuring it fully covers the screw slot. Then, press down vertically with a screwdriver and rotate. The friction from the rubber band fills the gap between the screw and the slot, making it especially effective for minor slippage or rust. Keep the screwdriver aligned with the screw's axis during operation to prevent the rubber band from shifting due to lateral force.

2. WD-40 Penetration Method For severely rusted screws, spray WD-40 lubricant around the screw hole and wait 5-10 minutes for the liquid to fully penetrate. This substance dissolves rust and reduces friction between metals, allowing you to try rotating the screw with a screwdriver afterward. If the effect is unsatisfactory, repeat the spraying and extend the waiting time, but avoid excessive use that could allow the liquid to flow into the chair's internal structure.

3. Thermal Expansion and Contraction Method (Use with Caution) Briefly heat the area around the screw with a heat gun or lighter (be mindful of controlling the temperature to prevent plastic parts from deforming). After the metal expands due to heat, quickly cool it (e.g., by spraying a small amount of freeze spray), using the temperature difference to loosen the screw. This method requires strict control of temperature and time and is only suitable for metal screws without plastic casings.

4. Electric Drill Assistance Method (Last Resort) If other methods fail, set the electric drill to reverse mode, install a drill bit that matches the screw's diameter, gently press the drill bit against the screw head, and rotate slowly. This method may damage the screw or the chair's structure, so it's recommended to have a professional perform the operation and only use it when complete chair disassembly is necessary.

II. Removal Points for Different Base Structures

1. Four-Leg Fixed Base Flip the chair upside down to expose the bottom. Locate the screw holes where the legs connect to the base. Use a screwdriver of the corresponding type (e.g., Phillips or flat-head) to rotate the screws counterclockwise. If the screws are too tight, combine the rubber band or WD-40 assistance methods. Disassemble symmetrically to prevent base deformation from unilateral force.

2. Sliding Base Such bases usually secure the legs with clips or slide rails. First, try lifting the legs vertically upward. If there's resistance, gently shake them left and right to aid separation. After separation, slowly pull out the legs along the slide rail direction, observing for hidden screws or fixing pins to avoid damage from forced pulling.

Precautions: Wear protective gloves before operation to prevent metal shards from cutting you. Store screws and accessories properly after disassembly to prevent loss. If the operation involves core components like gas cylinders, it's advisable to contact the manufacturer or a professional repair technician.