"There once was an old woman who swallowed a fly...." Much like the story, it's seems like building tooling and the tooling to build the tooling just compounds. I needed a jig for a bolt circle. I already have a block with a stub spindle that matches my chucks that I can do bolt circles with in the mill. I use to draw up a scale in CAD and tape it to the chuck OD for the required spacing. I decided to eliminate that and make a ring with index holes that slips over the chuck. Well to do that I needed to make bushings for the lathe change gear so I could affix it to the stub spindle. Then I find out that I don't have enough Z axis travel with the drill chuck in place for this project. Then I made a holder for the 1/8 center drill to fit the 3/8 collet in the mill.