Instructions for replacing the coupling
To remove the old coupling you must introduce the key between it and the housing, in order to go blocking the transmission axis.
The key must be then held steadfast and still, without making it turn, while the coupling must be unscrewed with a pincer to the right, namely clockwise.
The new joint should be screwed so just counterclockwise.
Operating instructions of the blender
Start operating the blender always with the lowest speed, at the same time press the glass jug against the engine block so that it engages. Before removing the jug let the engine stop, in order not to stress too much the engine and the transmission observe the maximum processable quantities and operating times recommended.