This knob locks the lens plate M6 X 25

This knob adjusts the height of the lens

M2 X 12 or M2.5 X 12 and nut 2 pcs. The camera should only be attached to the top. It should be movable at the bottom

M2 and 2.5 screws can be difficult to get hold of, hobby shops usually have such.

In Sweden electrokit.com has M2 screws

M6X10 and M6X25

Glue the bolt to the knob