The mechanism is the same as the previous one (KK-3). Maybe we can say that #3 work is easier than #1 or #2. If you say, "I'm not good at difficult works", we recommend you try #3. In fact, at first we were going to make it as #1. But, we rethought, "There is no problem for Karakuri Fans !". Therefore, we made it as the third work.