Reassemble the print head

Bambu Lab H2 Series
1

I am reassembling my print head and I have gear I don’t know where it goes

Gear
Gear1920×2560 828 KB

2

mechanismus-pro-vymenu-extruderu-pro-tiskarny-bambu-lab-h2d-a-h2c
mechanismus-pro-vymenu-extruderu-pro-tiskarny-bambu-lab-h2d-a-h2c540×540 12.2 KB

That gear belongs to the extruder switch cam.

It’s first seen in Step 5 in the wiki:

imgi_24_image-20
imgi_24_image-201036×583 181 KB

3

Gear2
Gear21500×2000 509 KB
Is this the gear, could it be extra

4

I don’t know why you’re reassembling your extruder to begin with, how would I know if it’s an extra part if I don’t know what you’re replacing?