|I found this tip on one of the sewing or quilting newsgroups (sorry, I don't remember which one.)
I have read about the benefit of using a seam guide for sewing accurate seams. But the only type I could find was a magnetic square that you place on the machine. I was concerned that placing such a strong magnet on my computerized machine would ruin it.
I've also used tape to mark seam allowances on my machine, but it left a gummy residue.
The small Post-It pad is a good alternative. It is about the same size as the magnetic guides you can purchase. The raised edge works better than tape to help you control the fabric, and the sticky surface does not leave a gummy residue.
To use the Post-It pad as a seam guide, remove the brown backing from the bottom of the pad. Stick it on your needle plate wherever it is needed. You can easily re-position it. Eventually, it loses some of its stickiness. If this happens, just peel off the bottom sheet and you have a fresh new adhesive surface.
I just made a skirt using the Post-It pad as a seam guide and it really did help keep my seams more accurate.