Norma, yours is a different take on how to do it and I thank you for the pictures--it makes sense and I am going to give it a try. You never know when trying something different ends up working better for you. I really appreciate your taking the time to take pics (I am pretty eclectic in my learning style and a visual usually cinches it for me.
I tried Laura's method of doing the HST by drawing a straight line down the middle and using the side of the 1/4" patchwork foot to line it up to the center line. Despite my best efforts, the line I sewed was not straight enough for me. So I ripped it out. You can see in the photo (if you enlarge it by clicking on it) the difference between where the holes are and where I subsequently drew the line I was going to stitch on.
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So, rather than getting frustrated, I pulled out my handy-dandy June Tailor HST ruler... line up the two angles of the square--there's a space where you insert the pencil and draw the line on both sides of the center line and then you can stitch right on the line rather than winging it. Afterwards, on the other side of the ruler, you line up the stitching lines on the dotted lines and there is a slit where you can put your rotary cutter and cut the two HSTs apart. Oh, yes, and after all that, you go to the middle of the ruler, line up the square and trim! I like that!!!
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I think it's good to understand Laura's methodology for prepping the HSTs and sewing them. However, I got done a whole lot faster by having the lines to stitch on rather than parallel to. My HSTs are all done. Now I still have to piece them together into a block.
It's lunchtime!!!