Hex screw fell out of Nomad 3

[WillAdams (William Adams (Carbide 3D))]

Probably an M4 for one of the lubrication ports, see:

Getting Started with Carbide Machines

Bearing maintenance video?

I found past requests for a maintenance video instead of written guidance for bearing and ball screw upkeep. Have not found anything since the October 2023 request. Is there even written with pictures available? I don’t want to do something that would cause more pain than help. Appreciate any guidance.