The visual is in the Media theatre - and it is really easy - and works too!!
Maybe I can walk you thru it here - with words -
1 - after you joined the half sq triangles together - to make the pinwheel - look at the seam that you just sewed.
2 - at the center intersection there will be a seam that is vertical - right at the center - from the intersection there are about 3 or 4 stitches to the end of that vertical seam. Those are the ones that you pick out - remove to the seam line that crosses it. Turn the piece around and do the same thing - in the same spot on the other side.
3 - almost done - lay the piece on the ironing board and stick your finger in the center of the pinwheel - on the wrong side - and wiggle - it should open up and then you can press the seams down - going around the piece - clockwise direction - you will then have a small pinwheel in the center - and the front will lie flat.
All it will take is once and it is great - do it on your four patch blocks too - their centers will lie flat too.
Ask me as many times as you need - glad to answer
5/21/2010 10:27:24 AM