While at Staples, I found these clips ($1.99 for 35) and it seemed like it was worth a try. And if they didn't work, I could use them as intended--as paperclips.
I was very pleased. They held securely, were easy to put on and take off when the machine approached them. I did pin the corners because I want to get the miter to fit just so.
I am happy to pass this tip on to others. I am able to spend the difference in the price of these vs the quilt shop product on other quilt shop items--especially threads!
Have you found something to use in your quilting that was intended for another use? What was it?
Thanks for stopping.