I am Libra! We are not lazy, but we ARE efficient (at least that's what I like to call it). We think about a problem and spend much time trying to find an easier way.... because there is ALWAYS a better mousetrap.
I found some work-arounds that seem to allow me to avoid some of the processes that I particularly dislike. PLEASE NOTE that these methods work for me but may not give you the result you desire... Thus, they are provided as informational ONLY.
Perfect HSTs
I suppose I could perfect my cutting/sewing combo to NEVER have to trim but that has yet to happen. Know that I try... and try hard... and most are so very close... but I want them closer. So I check each with my acrylic ruler and trim each one when needed.
But I still hate this step... I end up with thousands of teeny tiny slivers of fabric everywhere. The upside of this process is that the birds LOVE these for their nests. I put them into a suet feeder and then watch the local nests for proof of upcycling.

We all know that HSTs are a necessary evil of quilting and a big part of Clue #1 of Bonnie Hunter's Grand Illusions mystery quilt (GI)... so I needed a method that I disliked less than some of the other options.
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unsewn and untrimmed with HST
excess peeking out |
I will start with the fact that I am comfortable with my 2 1/2" squares... that they are cut "fairly" true. After cutting, sewing, and pressing the HSTs, I am just slightly LESS comfortable with their true measurement. So I trim... and trim... and trim....
But there has to be another way..... so.....
I place my HST under my square, lining up the seam line of the HST with the corner of the square at opposite ends (where the seams meet the corners).
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sewn and trimmed |
As you can see, there is a bit of the HST peeking out past the edges of my squares.
Keeping the
HST seam joints lined up with the
corners of the square, I stitch my seam. I ignore the fabric edge of the HST and determine my sewing line based on the edge of the square of fabric ONLY.
 |
I do not pin. The pin in the photos simply
shows how the HST seam lines up with
the corner of the square. |
 |
Excess of the HST sticking out. Make sure
it extends approximately equal amounts
on both sides and that the HST seam is lined
up with the corner of the square. |
After sewing, the pieces are stabilized and I scissor trim the part of the HST that peeks out. I DO have to be careful to not cut the square as I still consider it an accurate 2 1/2". I DO NOT PRESS until after trimming.
It is right ON the money!!!
I randomly check the trimmed squares to make sure they are a true 2 1/2" square, do my pressing, and consider it done!
I love it when a plan comes together.
Sewing squares into HSTs:
First off, I think drawing lines down the middle of squares to get half square triangles (HSTs) is tedious. Besides, I don't NEED the line down the middle. So my better mousetrap tor this part of Bonnie Hunter's Grand Illusions (GI) mystery quilt is as follows.


Since I want to draw ONLY one line, I place my 1/4" ruler on the wrong side of the square with the center line crossing the corners of the square.
I use my Frixion pen to draw a line on ONE side of the ruler (the line will NOT be in the center of the square!!).

After placing the square on the base rectangle (clue #2 of GI) I sew a scant 1/4" on each side of the line. This results in a sewn seam down the center of the square, which gives me the result needed for GI, and another sewn seam for a bonus HST from the remnants of the HST process.

I scissor cut on the drawn line, separately the piece needed for GI from the bonus HST.
And VIOLA! Progress on Clue #2 and a bonus HST for another project... or the back of GI.