I am reading the reviews searching for any possible further insight on how to use this tool. My duvet cover is all made, except for inserting the snaps. I thought it would be easy, and even bought a new snap tool, so I would have the little rubber rings, which are not sold separately. I have tried and tried and can't make things align and hold. I guess I'll have to go out and buy a couple of zippers to insert instead. The tool will have to go to the scrap heap.