Looking for a punch, scissors or a tool to make a very fine sawtooth edge cut on thick paper. It needs to be very fine enabling about 15 to 20 teeth per inch of cut. The picture below will show you what I am looking for. I have read that pinking shears are not good for paper due to blades dulling. Also, sawtooth scissors do not appear to give the fine cut I'm looking for. It will not be used a lot so cost will be a factor as well. I'm virtually "googled" out at this point. Hopefully somebody can help. Thank you.