Logan 4 Jaw Metal Lathe Chuck Depth Stops

Depth stops for a 6" (150mm) 4 jaw metal lathe chuck, specifically a Logan chuck. They might fit others. These stops help keep the work parallel at a specific distance from the face of the lathe chuck.

I have included STL's for stops in nominal sizes from 1/8" to 1/2" and have also included the Freecad file (0.18.4) so you can completely customize the stops however you wish.