For those of us with a low ceiling and limited space ...
I used 4 furniture moving wheels with a hole in the center pad.
The pinball legs were attached using the existing leveler - or with a nut between the leg and the moving wheels to lift it up.
I also sacrificed 4 legs and made extra (lower) holes for the bolts so I had space to put the playfield up 90 degrees without hitting the ceiling.
Probably not something to transport the pinball over long distances, but for moving it around in a room or pulling it out from the wall it works really well.
Moving wheels were bought here : https://www.jula.no/catalog/bygg-og-maling/beslag/innretningsbeslag/mobelhjul-flyttere/mobelhjulsett-333111/
... but they probably exist on Ebay, Walmart etc.