The message
from "The Medway Handyman" contains
these words:

Anyone know where I can get a wire rope type lock - sort of thing used for
bicycles - but longer.

There must be a chandlers near you - drop in and ask them to swage
thimble loops on the end of a bit of wire rope they'll also supply you
with.
Thread it through some plastic pipe first if it isn't already plastic coated.

--
Skipweasel
Pay no attention to that man behind the curtain.