Danny, I'm not sure it's only the Hegner that has that problem. I recently bought a new Excalibur EX21 and after using it for a couple of weeks I noticed I was getting the famous "hockey stick" bend in my upper blades. Finally figured out that the allen wrench set screw going in on the left side of the blade holder had loosened, leaving a hole inside. When I tightened the upper blade clamp, it drove the saw blade into the hole, bending it. I didn't have breakage, but sure messed up some blades.