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Hobbed Bolt which teeth are cut from the threaded part of the M8 screw have even better grip than tapped one. Given that, here it is the hobbing tool. It uses a Dremel drill with a cutting disk of 0.6 mm and a precise position system with 20 steps.
The base includes the Dremel threaded hole for a strong drill holding.
EDIT: new version available with rotating screw capability.