Does any one else have real problems with the new Vallorbe piercing saw frame, getting the bottom nut to secure the blade? I find that when I replace a saw blade putting top nut holds but the bottom nut doesn’t. I have about 6 of these Vallorbe piercing saws in my workshop - as I run classes, and they all seem to do it! 😬 I only have this problem with the Vallorbe piercing saw frame, never with my trusty old eclipse!