On 29 Aug, 21:06, Fred wrote:

Unfortunately the one supplied has about 15mm protruding, which means
that when you deduct 12mm for the plasterboard, 2mm for the plaster,
and 1mm for the paper, there's nothing left to go into the noggin
beneath!

Don't screw it in so far. There's usually plenty of thread on the
woodscrew part, you just screw them down until there's as much machine
screw thread as you need.