Once also I almost broke my thumb to press the unsuccessful attempt the bottom cover a "waterproof" watch after battery change again, I searched the internet for a solution. And I came across this good-value offer. Skeptical I have ordered the tool, it was delivered very quickly! At the price I hope nobody expects a precision tool! After the clock using the (housing, of course, not glass) quickly selected two plastic inserts, screwed, launched the clock with the correct aligned bottom cover (recess for elevator shaft!). Soulful pressed together makes it briefly and clearly audible "click" and the matter is settled ... In fact, amazingly simple, for the privately-occasionally-watch battery changer highly recommended!