Clean with alcohol and allow the two parts to be assembled to dry perfectly
Put a layer of glue and let dry for 5-10 minutes until it does not catch on the fingers
For particularly important or delicate repairs, apply a second coat after drying the first one. It is better an excess drying between the two glue layers instead of the contrary, not to be impatient...
Hook the two parts, pressing and hold pressure one to the other, minimum a couple of minutes.
Do not use the glued element before 24 hours.
Do not externally reinforce the gluing once it is done, the diluted glue acts as a solvent.