First of all, don't panic. Breakages usually happen when parts are bent too far, or too fast, so our advice is always to build patiently. However, if you've broken a part, there are a few tricks to fix your model (and no-one but you will ever know)! Our two favourites are: Apply one or two layers of good quality sticky tape to the back of the part, across the break. We use clear packing tape for this, trimming it to shape with a craft knife or sharp scissors. You can then shape the part, fix it in place, and for extra stability add a tiny drop of superglue to the outside of the break. This fix results in a strong repair that no one can see. Shape the part according to the instructions, and use some plasticine / modelling clay to fill the space inside the broken part to give it extra support. We actually do this if we are building models for TV shows when we know they are going to be handled – a small amount of weight makes them more resilient.