How to use the gear puller: 1) Please select the needles according to the size of the motor shaft diameter. Do not use a needle that is too small to push against a motor with a large shaft diameter to pull the gear, otherwise the lug will be broken. The glued gear must first be heated to melt the glue. Opt for tooth extraction again 2). Choose the gear puller thimble you need, install it into the rotating shaft of the gear puller and tighten the screws (note: the thimble with platform should not be too tight). 3). Install the gear puller rotation rod into the gear puller bracket. 4). Install the gear puller moving plate. 5). Secure the motor in the moving plate of the gear puller and move it until the motor shaft is aligned with the gear lug. 6). Rotate the gear puller lever clockwise at constant speed and remove the gear from the motor. 7) Gears with a maximum outer diameter of 11 mm and tooth height less than 12mm can be pulled Specification: Color: silver Material: aluminum alloy Product size: the length, width and height of the puller is about 4 x 2 x 1 cm, the length and width of the key is about 4.4 x 1.5 cm, the the length and width of the iron sheet is about 5 x 1.5cm, the length of the iron rod is about 2.5-5.5cm, and the error is about 1cm Package Included: 1 * Engine Sprocket Puller Extractor Tool Set