I use a vacuum chuck system from Bob Leonard, the Frugal Vacuum Chuck guy. I can totally recommend his gear.
I have chucks of various sizes, and needed a way to store them. They just didn’t fit very well in the drawer I was using, so I made a simple rack. I mounted the rack (just a shelf with slots) near the ceiling so they sit out of the way and don’t collect shavings.
I made a center finder thing to mark the center of a chucked piece. I often have a bowl or hollow form that has a tenon for my chuck, but no center mark. If I want to reverse mount it, like in a jam chuck or vacuum chuck, it’s really helpful to know where the center is.
This tool fits right down into the spindle threads, and I can tap the knob to mark the center.
I took a scrap piece of wood and carefully turned a cylinder to just match the threads. I then drilled a hole to match some scrap rod I had laying around. I sharpened the rod to a point and epoxied a knob onto the end.
A simple thing cut out of thin plywood. A point on one end and a couple saw-cuts on the other to mark optimal/minimum size for a tenon and dovetail.
The half-circle lets me get this in place when I have the tailstock engaged.
The picture above shows dovetail sizing, which is marked wide enough that the jaws will go into the recess. Below, you can see that the tenon mark matches the bottom of the jaws (widest part of the tenon).
I use these guides to either mark where to cut a tenon/dovetail, or to check (and adjust) the size after I’ve cut one by eye.