I had some similar to those years ago when I still have my Grace Pro frame, sold them or gave them away, can't remember. I'm now using magnetic bars from Harbor Freight. They are very strong and attach to my poles very nicely. To make it easier for me to pick up I added some knobs to each end as they came with holes already in them. These are the magnetic rods used to hold screwdrivers and such. I have 6 of them and believe me they are strong enough to hold your quilt sandwich taught.