In article ,
Appin wrote:
Would you say that using one as a spacer for (say) a deeper accessory is
legitimate?

Yes - although you'll have to modify it somewhat. They have normal
2.5mm fixing threads - so if you wish to put it between accessory and
backing box you'll need to drill them out. You may also need to remove
the spare 'lugs' as these can interfere with some fittings.

It will look a bodge, though.

For a start, the machine screws are M3.5 -- that is the normal variety
for electrical boxes

Indeed.

You're not usually expected to drill them out but rather to use one set
for mounting the spacer and the other set for mounting the accessory.

Most will tend to get used with plaster depth boxes which have only two
fixing lugs.

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.

Of course that sometimes causes problems of orentation and fitting of
some accessories.

Some boxes also have only one adjustable lug - which most would fit so it
can be used for horizontal fixing. See also my point about the large
plastic lugs at the top fouling some dimmers, etc.

--
*People want trepanners like they want a hole in the head*

Dave Plowman London SW
To e-mail, change noise into sound.