Watson

When I'm making four patches, that's when.

I'm doing the Mystery Train Ride and have cut my pieces into 2.5" squares. When I sew them together they come out to everything except 4.5" blocks. Sometimes bigger, sometimes smaller, usually smaller.

I have moved my needle over And sewn a scant 1/4". I've measured the resulting seam and it is less than a 1/4". I've measured the cut pieces and they measure 2.5"...So, what am I doing wrong?

Hints? Tips? Someone want to come look over my shoulder while I sew? (I've got brownies.)

Thanks, Watson