I've never done this before...but after reading all the diy threads, I figured worse come to worse is that I would have to buy one. You can do it! It's actually quite simple and was easy to figure out. I also used the paint stir thing from like home depot from when you buy paint. I broke it and then used that for the middle baffle. It was just over an inch but I figured that was a lot more square than me trying to cut some cardboard and make shift something out of paper myself.