Originally Posted by
Cogito
Love the idea of the button, annesthreads. I have read about that before but had forgotten about it. Glad for the reminder.
Youre welcome! I don't have toothpicks, which were also suggested, so hit on the idea of using a button or a small bottle top.
I also put two pins crossways through the centre of the backing, positioned to cross each other at at the centre point. That could also be felt through the layers, as an extra check.