DLE20 Prop nut

This is the prop nut for the DLE 20 single, a small-displacement two-stroke petrol engine for sport-scale models.

The part itself is the propeller retaining nut, where the engine uses a single central fixing.

Why it is replaced: this is one of the most safety-critical fasteners on the engine and is replaced rather than reused on a critical joint.

Fitting note: Torque to the factory figure, use the specified locking method and check it before every flight.