From TONY GRIFFITHS
Les Matthews’s nuts (Technology, 12 March) may have integral PTFE washers
to make tightening them easy – but this is also going to make them easy
to undo – prey, you might say, to vibration and vandals.
Compared with getting the nut on I would have thought that getting it
to stay on was of much greater importance – for a whole variety of safety-related
reasons. So, until someone comes up with a nut that slides on with finger
pressure, and can then successfully resist the loosening vibrations found
in so many mechanical applications – I remain unconvinced.
Tony Griffiths Buxton, Derbyshire
