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Exciting device. The concept is good and the function of the adjustment screw is powerful. The spreading width increases with greater speed towards the maximum. However the design is not so good (the angles of the 2 spreader arms change as you increase the width by screwing and currently it is designed so that the arms are parallel when closed and very slanted at maximum - it would be better to make them parallel at the middle width setting). The manufacturing quality is barely acceptable (as the arms were not symmetric upon delivery and I had to use some heavy duty pliers to fix / modify the brand new item after arrival). Typical China stuff ... made by amateurs that have no idea how the stuff they are making is actually supposed to work / to be used.

It's hard to twist, but you can. Extends norms.