I read on this wonderful board that the cheapest seam guide is a thick stack of post-it-notes to guide the elusive scant 1/4" seam. OMG - how easy! Why did I resist for so long??? And when it needs to be removed for diagonal seams, bobbin changing or loses its stickiness - just remove the one from the bottom and re-stick. Thank you, whoever it was that conviced me to try this! Makes me want to go sew JUST ONE MORE SEAM!