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HeartStrings blocks are pieced on a 10 inch foundation block and are squared to 9.5 inches after the foundation is covered with strings.

I square my blocks from the back.

I will be trimming from all 4 sides of the block so for my first cut, I’m going to cut about 1/4 inch off the foundation from the top and the right side. Notice that the diagonal line on my ruler is running down my center strip.

Before I cut, I double check that my foundation extends beyond the 9.5 marks on the bottom and the left side of the block.

I trim up the right side and across the top.

I flip my block around.

And using the ruler to measure exactly 9.5 inches, I trim the remaining two sides.

Here’s my 9.5 inch block.

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