I need to install some stair treads in a home. The treads are going between two walls and I know that the walls will not be straight. I have seen a tool in some magazine that you can use to measure the distance and angles between two walls for treads. I have found one called the Wheaton Stair Wizard http://www.amazon.com/Wheaton-Tools-...ews/B0000224Q2 . It looks like a great tool but very expensive...$170.00. Any one else have others they may know about or plans for one you can build yourself. I think a very cheap one could be built but would like to have a good one that I would not have to mess with a lot to make it work right (humm... maybe I do need to spend $170.00). Any info will help. Thanks