Fold the trim piece by half lengthwise and press.
Clip them into place, then sew them with a 14 seam allowance.
Fold the trim piece over the outer fabric and press nicely.

Image Credit: Lorrie Nunemaker via YouTube
Step 3
Use the cut-out piece as a template to do the other 3 corners.
Press the upper seam well, then sew right along the edge of the lining fabric.
Center the hinge on top of the basket seam and sew it.

Using a funnel, fill the pincushion slowly with some crushed walnuts or similar, sew the gap close.
*All these images are credited toLorrie Nunemakervia YouTube.
Easy Pincushion Thread Catcher Sewing Tutorial
