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Utopia: the extent of protrusion of the grub screw might affect whether or not the tool actually works so is subject to a bit of trial and error (read in and out adjustment). I seriously considered trying to make the protrusion revolve so the circlip will glide into place rather than be forced into place, but that was just too difficult to do and the protrusion height can only be about 1mm to 1.5mm anyway and the base is curved. In the end, I settled on a SS grub screw as it is probably harder than the spring steel of the circlip and even thought that the existence of the thread might assist retention of the circlip in front of the protrusion, provided I screw the circlip in the right way.
Luddite : Thanks - I hope the heads will be more mobile than book ends in the reasonably forseeable future
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