You can use Timtex as a stiffener but I use the same template plastic I posted about from the $ store cut into 2 approx. 4 inch squares. I turn the wallet right side out and slide the plastic into each side. When it is positioned perfectly, I topstich 1/8 all around the edge and down the center to hold the fabric folds and so it folds nicely in half. My DIL likes a bit of Velcro so I cut a 1-1/4 piece in half and stitch it as I topstitch. Yes if you go slowly, you can stitch right through the plastic. I backstitch on both ends of the Velcro. The hook side always gives me trouble unless I cover it with wax paper. It removes easily after sewing.[ATTACH=CONFIG]504303[/ATTACH]