decent tip to make rolling cabinets stationary

FWIW, I just happened to see the "Work Table and Clamp Cart" episode of The New Yankee Workshop recently, where Norm built a rolling work table that could be made stationary by pulling up on a cord that was attached to two hinged wooden blocks that locked a board (one on each end of the table) with two wheels attached to it in place.
As they say, a picture is worth a 1000 words. Hope this helps.

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