1. Measure the Gap

• Measure the space between the cabinet and the wall (or next cabinet).

• Subtract a few millimeters (e.g. 2–3mm) for wiggle room and expansion.
  
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2. Cut the Filler to Size

• Cut the filler panel to your measurement. If the wall is uneven, you may need to scribe the filler
  (shape it to the wall) for a perfect fit.

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3. Fit a Cleat Inside the Cabinet

• Fix a small timber cleat inside the cabinet, flush with the face where the filler will sit.

• This will give you something to screw the filler into from inside the cabinet.
  
   

4. Position the Filler

• Hold the filler panel in position, flush with the cabinet face and plumb (vertically straight).

• Always double-check level and flush alignment before fixing permanently.

• Clamp in place if needed.
  
   

5. Secure the Filler

• From inside the cabinet, drive screws through the cleat and into the back of the filler panel.

• Use short screws to avoid piercing through the front.