"stuart noble" wrote in message
...
cj wrote:
Another thing you could try is fitting a larger size plug (once you
remove the old plug)
As already posted the screw trick normally works but you can always run
the drill in again to remove the plug.
You posted using a 6mm bit.
Normally a 5.5mm is used for Red plugs and a 7mm for Brown but if the
plugs came with the shelf they could be any size .
Try your local DIY store for plugs of different sizes.

HTH
CJ

Often you can just whack a smaller plug into the bigger one, which
effectively adds packing without removing the plug

That is my usual first option and it has a high success rate.You know it is
going to work when you have to knock the new plug in with a screw.

Adam