Methods, systems, and devices for manufacturing a wearable ring device are described. The manufacturing assembly may rotate, by a rotational component, an inner housing member of the wearable ring device to a radial orientation based on an optical alignment process. A positioning component of the manufacturing assembly may insert and align an optical component of a flexible circuit assembly into at least one aperture of the inner housing member by moving the flexible circuit assembly from a first position adjacent to the inner housing member to a second position on the inner housing member. The manufacturing assembly may secure one or more edges of the flexible circuit assembly onto the inner housing member using a plurality of arms of the positioning component and apply, by an automatic adhesive dispensing device of the manufacturing assembly, a polymeric material to adhere the flexible circuit assembly to the inner housing member.