I've seen it, but have been using a strip of moleskin (found in the foot section of the drug store) that sticks and unsticks easily. Cheap and it works beautifully
I just looked this up thru Google, it says it's for pieces up to 4". It's not very expensive, but if you ordered it somewhere, shipping would cost as much as the gadget. I think I'll stick with the 1/4" foot.