Ta Da! I'm working away on my Spools blocks!
One thing that was continually annoying me with my blocks was that little corner where the spool top or bottom met the thread.
This is how it should look.
Trouble was, on a block with four of these intersections, I was only getting 3 perfectly aligned. I would then take the bad corner, un-sew it, fiddle with it, sew it again, and get it right. After doing this for four or five blocks I got to thinking there must be a way to get all 4 corners perfectly aligned on the first try, and there is!
Using my Pilot FriXion pen I measured a quarter inch from the edge and marked the front of this seam.
Then I measured and marked a quarter inch down this diagonal line, on the back of this piece.
I then ran a pin through the line on the back, then the line on the front, to get the proper placement. Then I would pin and sew.
Now I'm four for four on those corners, every time! The pen marks disappear when I press the seams.
I've not heard anyone mention that they struggled with this part of this block, some folks probably were able to sew their corners more accurately than I and got it right the first try. So if you make this block and have no issues with those corners, don't worry about the marking and pinning, but if your blocks are off a little give this a try!