Brill Lawn Mower M5 Wing Nut

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One of the wing nut designs found on Brill lawn mowers, specifically, the Classic, Comfort and Luxus models. The design relies on the insertion of an M5 nut in the bottom. By design, the nut does not insert fully but extends 0.5 mm from the bottom. This is to mimic the original design where there is a slight extension to prevent the wings touching the metal when turning.