Today’s word is from a discussion of eccentric bottom brackets – grubscrew:

…which bemoaned detents created in BB eccentrics by grubscrews. If hollow-point grubscrews fix that, then I can’t think of any other problem with them.

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I assume “grubscrews” is the UK equivalent of setscrews?

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Technically, a grubscrew has no head at all, and is turned by a small Allen wrench or screwdriver. Thus it can screw down below the surface against an internal sliding object.