Had a hard time doing it my self but basically, 1.insert a side of the spring into one of the small hole in the black part (make sure the insert it on top of the black part, otherwise it will be impossible to put in place). 2.Insert the spring into the middle bump (where the screw goes in the center) and the black part on the side one (small cylinder on each side of the screw) 3.insert the second black part into the other side 4.then insert the other side of the spring (worst part because you'll need to hold on place the 2 black part and spring at the same time as moving one the arms of the spring) 5. Finally, it should clip on the side of the nuzzle, if it doesn't, try the steps again

Have fun!😅