My Delta 22-540 planer, like many portable 12" units, lacks a cutterhead lock, so I made my own.

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STOP CUTTERHEAD CREEP WITH THIS SIMPLE HANDLE HOLDER

My Delta 22-540 planer, like many portable 12" units, lacks a cutterhead lock, so I made my own. I cut an 8"-diameter disc from 34 " plywood and cut a notch in it to match the planer's height-adjustment handle. After setting the cutterhead to the proper thickness for my workpiece, I slip the disc around the handle and clamp it to the body of the planer as shown in the drawing above.
—Paul Lonergan, Lancaster, Ohio