Jigging World Power ball Knobs for Penn Torque Spinning Reels New Light Weight Round Aluminum Power Knob For Penn Torque Spinning Reels.Includes two Ball Bearings. This knob is not designed for specific reel. You can install this knob very easy. To attach the Power Knob to your existing reel handle, you must first drill out the knob rivet on your original handle. A "B" drill bit (.238") is then used to enlarge the hole to accept the 5mm knob pin. The Power Knob is then easily attached to the original handle with the supplied screw. Recomand thread locker Blue Loctite 242 should be used to secure the screw in the pin.