I recently went to a lecture given by Cindy Casciato. She is very good speaker and she introduced a new tool and method that she had "invented". the tool is called "Magic Triangle Method Tool" and it is used to make 1/2 sq and 1/4sq triangles. Tool looks like a 12" ruler but is 5/8" wide and has a center line in it. You cut the squares 1 ' larger then the FINISHED size of the block, put the center line corner to corner and draw a line on either side of the tool. Then sew down each line and cut in the center. This gives you 2 1/2sq triangles. What makes this method different is the you DO NOT cut squares block size + 7/8" (we all know how hard that is). but you cut block +1". The extra amount is built into the ruler to help make block the correct size. I have used this several times to make 1/2 sq triangles and it really works great and makes perfect blocks with out hassel of cutting 7/8". This method can be used on any pattern where 1/2sq triangles are used. Just add 1/8" to blocks cutting instructions when cutting and then used this tool. Tool is only $10 and I think it is well worth it. It can probably be bought on Cindy's web site " www.cindycasiato.com" (and no she is not my best friend nor am I related). She also shows how to sew lines like you are using thangles but this tool is cheaper than thangles and can be used for any size block while you need specific size thangles for different block size.