Take a deep breath.
Log Cabin is one of the easiest blocks to adjust.
What's the problem with your blocks - they were all supposed to be 12.5" and they turned out to be anywhere from 11.5" to 12", or were they all were larger?
So you find the smallest size and then trim ALL the blocks down to THAT size. Just make sure the middle square is centered - you can even just eyeball it.
NO ONE is going to notice the difference when you put them together. That's the beauty of the design, regardless of the layout.
It's still going to look exactly like you originally thought, except the quilt top might be a couple of inches smaller. Big deal. So you put on a wider border.
:thumbup: :thumbup:
You could also add another round on each block, a bit oversized, and then trim the blocks down.
Happens all the time.
And foul words have never, ever, ever crossed my lips.:mrgreen: :mrgreen: Ever.
Can you post some pictures?