>>1231780>Though I could achieve the same venting by punching holesYes, that was my first idea, but then I realized there's no need with the paper binder clips which serve two functions then. If you decide to make holes, there's a cheap special tool called a "sheetmetal hole punch" that makes perfectly round holes (pic). Three holes 1/2" in size, near the bottom and three at the top, would do the trick I think.
