I already use a carpenter's T-square (purchased from a big box hardware store for about $12) to square up the corners of my quilts. However, the long end is only 3 or 4 feet long which makes connecting the corners a bit of a struggle on large quilts. Someone posted on a different thread about snapping a chalk line when squaring up quilts. After a bit of searching, I found this website that shows how to do it and actually answers my initial questions:
http://missesstitches.blogspot.com/2...it-square.html
I might invest instead in laser levels per this tutorial:
http://dreamweavers-quilts.com/2008/...hort-tutorial/
It's just that I cannot bend down to use the floor for a large quilt, so I end up using my kitchen island and always have part of the quilt hanging over the edge.
