Hi Girls

I know someone here will have an answer - I can hoop my fabric with the hoop, or use the spray for hard to hoop heavy towels. Seems as though my fabric always seems to loosen, even though the screws are tight. I heard there is something that you can put inside the hoop frame to keep it from slipping, can anyone tell me what it is. Is it that rubbery mat that they use for drawer liners, I can't remember but I know I read it somewhere, mayb it was tape, my brain is a little slow today......help

Thanks Lori