Sir Troll. This is not a representation of original or meant to be used as visuals for renderings. You might have not noticed the low asking price, low polygon count, and the usage in games for common folks.

Yeah... it's obvious that whoever made this never had the genuine article and doesn't know how it functions. That vertical slat of wood between the wires is used to wind up and tension the saw. It should rest against the horizontal bar, but should not be connected to it. In this image that slat is clearly set into the horizontal bar, making it unable to move, and unable to put tension on the saw blade. Please, artists. When you make a representation of any object, please first study that object carefully and try to what the function of each part is. And if you don't understand anything, there is the internet full of knowledgeable people that are happy to share their knowledge. There are communities of traditional woodworkers out there who know every tool of the trade inside-out. And for medieval objects, go ask archaeologists and historical re-enactors.