1. Find an unnecessary ceramic jar or cup.

2. Mark the bottom of the ceramic cylinder, and make several marks one by one. Marking can prevent the wrong position when drilling.

3. First, drill a hole with a hard wrench. Do it as soon as you are sure, and pay attention to the frequency of exertion.

4. Then press it on the glass and drill it again. Add a little water to the bottom of the cup when drilling, otherwise the friction temperature will be too high.

5, or when drilling, the drill bit is tilted, drill an angle first, and then drill when there is a fixed point.