Andy Burns wrote in
:

http://upvcspares4repairs.co.uk/upvc...crew-hardware-
parts-repair.html

Thanks for the link - I also saw the cavity plugs which look good.

I have a bit of a niggle about modern screws - the root diameter is not
tapered ligh and ond "No8" type screw - so you lose the wedging effect as
the screw drives deeper