Clear plastic first aid tape for the back of rulers. (It is textured, inexpensive and easy to use. <G> And you can see through it, but it keeps the ruler flat to the fabric.)
My Martelli cutters.
Horizontal spool feeder/adaptor. Wouldn't be without them for using metallic/lamé threads.
Different gadgets and tools depending on what I am doing at the moment. <G>
Pati, in Phx