Hi all, even though I measured, cut, sewed and pressed as well as I could, my pinwheels were still a bit off, by 1/16 inch here or there. The centers matched, and before measuring, I thought they looked pretty good. After getting out the ruler and looking hard, I realized that I would need to mark where they were a little bit short...... so, after thinking for a minute, I found some return address labels on a sheet. They are about 1/2 inch by 1-1/2 inches. After measuring a block, I wrote a little note on a label and stuck it lightly on the block. I've sewed together the row of 10 blocks so far, using my new smaller seam allowance, and the border after pressing measures 40-1/2 inches plus about 1/8 inch.
The labels stick well enough to stay on through a little handling. I'll have them off in a day or so, not long enough for the adhesive to stay on the fabric of the blocks. I thought this was a pretty neat way to mark the blocks, plus it uses up some of those labels that aren't needed so much, now that I pay bills on line
Happy sewing, Kathy