Roger Hayter wrote:

wrote:

I have some shelving in which the plug-in uprights are 37 mm O.D.
Is that anything like a readily-available inexpensive standard size in
any suitable material

1 1/4"plus duct tape?

About the closest you'll get with domestic stuff, I think, 1mm out to
start with.

http://www.hendersons.co.uk/pipework2/page2.html