I like the rack, even without owning so many arbors, it stimulates an approach for mine. Instead a rack of welded studs, a handful of short bolts with a slotted rack.
Seems easier/safer than engaging a stationary - upside down - threaded element, especially if still mounted with cutters. Right now they rest in carpet tubes, whether 40 or 50 taper.

When dismounting an arbor, keep spacers in order by ID/ length, thinnest in 3" x 5" zipper closure bags, marked with felt pen. 'We' called anything over .100 a spacer, less were shims.