Suitable for many Vespa models on the alternator side or clutch side as well as for numerous later Piaggio, Gilera, Aprilia, Derbi and LML vehicles.
The original Piaggio diaphragm spring, commonly known as a half-moon wedge, differs in design from standardized DIN versions. Piaggio uses larger radii, which means that the diaphragm spring can be inserted more cleanly and works much more comfortably during installation. This shape is often the better choice than a rigid standard solution from the industrial sector, especially for original Vespa engines.
A Woodruff key is not designed to transmit drive forces. It is only used to fix and position the components in relation to each other.
A Woodruff key must sit properly in the groove and must not tilt. The correct tightening torque of the connected components is then crucial for operational safety.
The original Piaggio Woodruff key is more than just a simple half-moon wedge. Thanks to its shape, which differs from the DIN standard with larger radii, it can be fitted cleanly and fits better with many original Piaggio components. It remains important: The Woodruff key is positioned - the cone and correct tightening torque provide the frictional connection.
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