Frankly, for the price, is not surprising that the tool makes junk. But it was effective (but not efficient) to change the size of my bracelet. It should actually push either horizontally or we twists the tip (there are three). I placed a bit of paper to raise a little bracelet and well match the minor axes of the bracelet to the tool tip. I was able to experiment in order to better adjust my bracelet (which avoids return to the jeweler for the same result). To say that it is easy would be lying but with a little attention to detail, there is no problem.
