2. Take out the matching grinding head. It should be noted that the handle diameter of some grinding heads is too thick or too thin to match some electric grinders, so you must choose matching ones.
3. Put the electric grinding head directly into the top jack of the electric grinding machine and insert it directly into the bottom.
4. Press and hold the metal button on the electric grinding head, and turn the white metal part with the other hand. At this time, the metal button will automatically sink and lock with the rotation of the white metal sucker part.
5. Tighten the white metal chuck with a wrench.