Have been building some walkovers, stiles. Could not get any after the first set to come out right, after some serious head scratching, and some serious wasted time, I looked at my SPI combo square. The angle markings are off at least 4 degrees from side to side. There is no way you could ever use this to build a left and a right. Bottom line sometimes its not us. I cringe sometimes when I see some of you fellows talk about buying second rate tools. Don't want you to become frustrated over some thing that you can't control.