On Thursday, 24 January 2019 20:22:45 UTC, Scott wrote:
Now on to part 4 of the Schuko installation problem. I have bought a
dry lining box that will fit the chipboard (25mm lugs). On removing
the previous box, I have discovered that the size of the hole is
larger than (the inner part of) the box with a bit of slack on all
sides. I am hoping that the design of the dry lining box will cope
with this.

If not, what is the best way to build up the chipboard? I had four
ideas:

1. Plastic wood and file to shape
2. Thin ply attached using panel pins
3. Cardboard and panel plns
4. Screws, possibly with a washer to get the size right

However, it does occur to me that maybe the hole should be larger than
the box to allow final adjustment of the socket.

Any ideas, before I start? Scott

My first idea, check what depth back box you have. I think you'll need 47mm..

Just how much bigger is the hole than the back box? If the gap is more than the lugs can cope with, but not larger than the lip, I'd probably use a bit of one of the building adhesives, squirt round the back box before pushing it into place. Allow plenty of time for it to go off.

(I fitted my first Schuko the other day. Preferable to using one of the rather bulky Schuko-to-13A adaptor which got in the way.)