I ordered a new carpet patch tool that is called a cookie cutter carpet tool. It’s about 4 inches round and works just like a cookie cutter. Just set it on the carpet and twist and it cuts out a perfect circle. I’ve got rental properties and this works great for small patch jobs. I’ll try and post a link if you want to check it out or just google cookie cutter carpet tool. http://www.tools4flooring.com/crain-174-carpet-repair-tool-p-97.html