I also had the Tamperproof Torx on mine - I used a Dremel tool with a small round metal bit and just carefully plunged down on the little nub in the center that makes it tamperproof. Only need to grind it down a millimeter or so, as there isn't much torque on these screws and the torx bit needs just a little depth to grab on it good enough. If you have the tools handy it saves having to buy the tamperproof bits online.