Will wrote in message ...
Something like these - have an hole to pass cable through

http://www.alpelectric.co.uk/shop/cc...ted-p-747.html

for cameras like this
http://www.made-in-china.com/showroo...ST-DV150-.html


At this price I can only assume they are quite substantial

Substantial rip off. It's only a piece of steel plate bent into shape. Looks
like it ought to cost about £10.

Bill