David's finally building his tank car

[nachoman]

When I worked for an art supply dealer, I picked up a compass that used a small diameter lead, like a mechanical pencil. I removed the lead and replaced it with another point like the one on the side of the compass that is the center of the circle (there must be a term for this, but I don't know what t is!) Then I could scribe the circle with several turns of the compass, making it easier to follow the line with a knife.

I could swear I bought a compass set once that came with extra points and a tiny little blade. At least somewhere I remember seeing one. Of course I will probably remember way to late to be of any help