[modeleng] Re: How do these work please?

My guess is that the centre hole is tapped with a taper tap, and the Allen 
keys serve to screw a hex headed set screw into the arbor, thus leading it 
to expand and grip the work.
I normally make one up as required - for some reason, very rarely does one 
made previously happen to be the right size for the 'job of the moment'.

Peter Chadwick
Swindon

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