Spring Loaded Scriber

I have started to rely more on my CNC mill to scribe outlines for 2d parts.
I typically scribe, band-saw, and then end-mill the profile. 

I made one version but was unhappy with the results and so made this version.

Took a 3/8" solid rod.
A 1/8" carbide bit with a 0.040" end.
Spring and 1/4-20 machine screw.

It needed to be 3/8" so that it would fit into the Sherline collet.