Comment by hydrogen7800

This takes me back, as well as some of the replies to your post. I still have most of my drafting tools from high school, including eraser shields, etc. one thing I didn't see you mention, and would help with dingy vellum, is a pouch with eraser granules you squeeze to put a thin layer of dust on your drawing. This will pick up excess graphite as you slide your t-square or parallel over the drawing.