Mechanical pencils don’t only come in metal and plastic ... The archetypal architects’s drawing tool, Staedtler’s clutch pencil was the ubiquitous drafting device in the days before computerization.

A clutch pencil is a tool used for technical drawing, though many fine artists also tend to use them. They are a type of mechanical pencil that has a hollow body and a ‘clutch’ mechanism at ...

You might have, or can inexpensively buy, a mechanical pencil which has the feeder button on the side rather than on top, as usual. With the pencil in hand, [ptkrf] shows you the simple procedure ...