- Lay out all 4 pieces together.
- Take two pieces and push the corners together, making sure the sharp edge is on the back and follows round. If it's a rectangular stretcher frame you will need two differently sized pieces for this step.
- Take the third piece and push this into the opposite corner, turning it round to make a U shape.
- Take the last piece pushing into the last top corners, making a square shape.
- Use a mallet to tighten up.
- Watch our step by step YouTube Video below!