Nippon Chuko Patchwork Spatula, 4.5 inches (11.5 cm), F2-31, Handicraft Supplies, Sewing Tools, Marking

This is brilliant. I do free-form hand embroidery quite often, and this tool allows me to mark the cloth with a slight indentation. It is quite invisible once embroidered. In any case, it disappears when washed or even handled much. I prefer this to using pencil or whatever.

I used this to make HST's and mark a bunch of fabric. I love it!