When I used it for dumping the inside of the valve the other day, the magnet at the tip was removed and it remained inside. I pawned for a moment. I pulled up while shifting with a piano wire or tweezers. It seems that caulking of the case where the magnet is inserted is defective or poor design. Should the inside be stepped so as not to come out or fold back the end face? It will be tough if you get out of the important equipment. This product is no longer used. Discard it.