Here, let me tell you a trick: The first step, measured with vernier calipers bearing a coat of inner hole diameter, for instance, is 55 mm. The second step, saw a piece of about 20 mm wide, about 5 mm thick, long approximately 60 mm plate. The third step, in the middle of the plate, punching a center hole. The fourth step,, centered on the center hole with a round planning a 58 mm diameter of the original curve. Fifth, on the grinder, put the spare parts other than the original curve according to the original curves trimming. Step 6, bend iron hammer, hammer (note that camber wants even using vernier calipers measurement hammer after bending plate length, the size of 55.5 MM. Step 7 in the journal center hole, with 5 mm drill into a hole.Using M6 screw tap set button. Step 8, find a long buckle the M6 screw from the concave surface of the iron bar of twist in just outcrop (can) Step 9, it is convex in the direction of the "dead end" hard pressed into the bearing outer ring of the ball groove. Step 10, the long screw to tighten the direction of rotation, at this point, "dead end" of the bearing coat will behave yourself out! The principle of application of this method is that the choice of iron, depends on the bearing outer ring diameter of bore flexible.When the bearing outer ring of the inner hole diameter, the greater the iron bar, of course, the more the more wide thick.(note that also adjust screw screw holes) at the same time, also need to adjust, is in accordance with the bearing outer ring of the inner hole diameter flexible plate length.The "small device in use after don't lose, can use for a long time.