I made a rig with a similar concept, but I used all wood. The dibble pins are dowels. It's great not just for making seed holes, but for marking out for spacing. I often plant in wide rows, and running the dibbler/marker down the wide row on a diagonal gives me perfectly offset plantings, zigzag style.
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"Red meat is NOT bad for you. Now blue-green meat, THAT'S bad for you!"
-- Tommy Smothers
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