A housing of an imaging unit is disclosed. The housing comprises an outer surface and an inner surface, wherein the inner surface of the housing defines a lens channel sized to receive a lens barrel. Further, the inner surface of the housing defines a helical step in the lens channel, wherein the helical step protrudes outwardly into the lens channel, and wherein the helical step is angled at a first predetermined pitch. Further, the inner surface of the lens channel defines a glue pocket, in the lens channel, which extends from the inner surface of the housing to the outer surface of the housing such that a first edge surface, defining a portion of a periphery of the glue pocket, is coplanar with the helical step.