Summary: vendors in the link Re filing Yes you file grind the sides of the 21 or 22mm deep socket or you could use channel lock pliers or vise grips but then you couldn t use a torque wrench Here is another nifty deep socket if you could find this type you wouldn t have to do any grinding again however I don t know how you d get a torque wrench involved in the process
Image Dimensions: 800 x 600
Image originally found here.