A half baked design in my opinion. Though it is very well made, there is no way to lock up and secure the garment from preventing the button being popped off while stretching. We had to clamp the garment closed with a small c-clamp before stretching the pants..
Another manufacturer makes a plastic constructed stretcher that secures the button/zipper area closed, but it's a poorly made and will easily break ( bought one a while ago and it broke) This wooden and metal bolt stretcher needs to incorporate the design of that plastic one and then you would have a great product..