thank you for putting this up for us! i'm gonna start building my own stretcher bars... i bought premade stretcher bars for an 18x24 canvas from the local art store that my teacher said i HAD to buy from. $42 later (plus $20 for the canvas), i'm feeling incredibly ripped off now : (
For a small investment, I would add a pair of canvas pliers. They make getting a good tight stretch a lot easier and if you're going to do many canvases they keep the strain on the hands down. Also I've found the best way to get a good even stretch is to start at the center of each side, then go to the opposing side and working with a few staples at a time out to the corners.