In message , Chris
Styles writes
To avoid ruining the flooring I have just put down, I'd like to swap the
bog-standard castors on my office chair for either a rubberised castors, or
even normal feet (which can then have felt pads applied)


The castors on my chair are not threaded, but are a 10mm dia peg,

Are you sure it's 10mm ?

I measured the spare set of feet I have and they have an 11mm dia peg

--
geoff