Octagon knob with heat-set insert M5 - clamping knob, 4 sizes 16/20/25/30 mm, no supports

Eight flats. Twelve would have been invisible - the faces would sit less than one percent below the circle. Eight sit at 92.4 percent, and that you can see and feel. Bored 6.4 mm for a standard brass heat-set insert M5. Melt it in with a soldering iron at about 220 C and let it cool under light pressure. M5 with an insert carries more than a printed M5 ever will, and it can be undone and done up again without thinking about it. ## Sizes in the download All 4 diameters, same shaft fitting: | Dia…

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