So I got a couple of fans I'm wanting to install in my canopy (thanks Seth the Wine Guy). They are 120 mm which I think is pretty common. I have a hole saw set that has both 4 inch and 5 inch saws. Neither fits just right. I looked online and 120 mm comes out to about 4.7 inches. What do most folks use for cutting the holes for 120 mm fans? Do they make a 120 mm hole saw? If so does anyone want to let me borrow one long enough to drill 2 holes?