Derby Worx Pro Axle Pliers Tuning is a breeze when you use this tool. First use the perfect gap to properly space your wheel and axle. This will also give the proper relief needed for the pliers. Mark you axle and then you can simply rotate until desired tuning. When removing very tight axles, the axles may be bent if proper care is not taken. Remember to pull the axles straight out of the block; avoid pulling at an angle as this may cause unwanted bending of your axle.. The use of these pliers may lightly scratch the outer edge of the axle head if proper care is not taken. Since most axle heads are tapered, this scarring will not affect the performance of the axle. We suggest to sand the inside edges of the pliers smooth prior to use to help eliminate this problem. https://youtu.be/6p9ygEdMNrQ?list=PLjHa5wJcPyUHbHLsFHrzIWBFwp24UFyrt