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7 A round file will work for opening up the hole—essentially making it an oval, by cutting 1⁄4-inch from the top and another 1⁄4-inch from the bottom—but it’s going to take a while to cut it by hand. A hand grinder makes for much easier work, but either way, this is the time-consuming part of the installation. It could probably be done with a Dremel, but expect to go through a lot of those little sanding drums. When you’re done, make sure to blow off all the shavings and lubricate all the pivot points.