The crack to be
joined must be clean
and free from dust, dirt
and grease etc.
This may sound like a cliché..... but this is extremely
important.

Above is most of the 'kit' that's needed to glue up this sort of damage.
Glue (I
use an aliphatic resin water-based glue), a syringe,
some warm water, a damp cloth,
greaseproof paper, a couple
of wood blocks for clamping purposes and some Cam
clamps.
WARNING - If an
epoxy resin type adhesive or '2-pack'
is used there is No
Chance of redoing it if you make a mistake. Once
done - you're stuck with it !

Now I have a secret - well not anymore, of
how to get glue into a deep crack.....
by using a 'clean' air supply blown in by a
compressor.
Please note - It must be clean with No
in-line oiling system which can contaminate
the air.
Warning - Glue can fly
absolutely anywhere if you do this, so Be Careful.

A lot of glue can be used as it can be
easily wiped away with a damp cloth.....
but the glue must get to all
parts of the joint.

So far, so good.