In message , Frank Stacey
wrote


My ignorance again - what is "torx" ?
The socket I am concerned about is certainly hexagonal and its within
a fraction of a mm of 4mm across.

The screwfix security set (previously mentioned) has both the 4mm hex
(Allen key) and 4mm Torx (6 splines) with the holes to fit security
fittings

--
Alan
news2006 {at} amac {dot} f2s {dot} com