Before assembly, check the fit and remove the release agent with isopropyl alcohol or acetone. Cut off sprues with a saw/cutter. Wear a dust mask or respiratory mask when machining to avoid inhaling dust particles.
Carefully heat warped parts (e.g. with a hairdryer) and bend them into shape. Glue with 2K or superglue. Unpainted cast parts darken over time and can turn yellow - especially when exposed to UV light.
Screw in the two lower ends of part 3 by 90 ° and glue them to the bomb body (just above the horizontal groove).
For part 2, also screw in the ends and guide one leg through the loop of part 3. Then stick to the bomb body. Attach to the loop, where both parts are nested, with some super glue. Make sure that both parts are at 90 ° to each other.
Now carefully bend part 1 (windscreen) over a round material and glue it together at the overlap. Then slide over the two brackets and fix from the inside with adhesive.