Dave Plowman (News) wrote:

And you're not 'expected' to use them for this purpose - they're for
mounting a standard accessory to trunking etc. Use as a spacing frame is a
secondary one.

ah, well if you use the things designed for the purpose of extending a
backbox rather than those designed for conduit, it all works much better
- the same screws just fit through the unthreaded lugs on the extender
and go into the original back box:

http://cpc.farnell.com/PL08925/elect...us0?sku=bg-818



--
Cheers,

John.

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