it can be repaired! I once encountered something like this. First of all, I need to know its internal structure and principle before I can repair it. I found that its principle is the same as that of the spring automatic ballpoint pen commonly used in our study. I guess you let go too quickly when pressing the switch, which led to the failure. Repair method: first remove the rubber band inside; Put the switch upward on the table, hold the outer part downward, remove the coat, pry open the upper seam with a knife, and the internal structure will come out. There is a circular clip with an inclined plane in it, and then it can be assembled and restored.