[Part Name] Thrust plate [Description] Used as a washer between the counter weight and the armature assembly [Manufacturing] Metal casting is used to make the plate and the holes were made by drilling. [Reason for Using Materials] Steel is used because it would make the plate sturdy. [Forces Applied] various forces from the parts onto the plate. [Functional/Cosmetic] functional as it acts as a washer. [Quantity] 1 [Complexity] 2 [Reason for Shape] 
The plate is rectangular to mirror the front piece of the armature assembly which holds the counter weight.