The lever is held in place with a pin through the main body of the mechanism. Which was where mine was broken, so I just had to push the pin from the lever. On test fitting the lever in the new part, I found it a bit loose compared to the original. I understand there are two different diameter levers, so mine must be the smaller. I used a piece of electrical tape to increase the diameter enough to make a snug fit. Before refitting the pin I used a drill bit the same size as the pin to clean up the printed part and the lever, I wanted the pin to slide in and not risk splitting the plastic or fowling the hole in the lever. This was the most ‘squeaky bum time’ of the whole repair, but using a tiny g clamp managed to push it home.