A method is provided for making an annular reinforcement structure having inner and outer reinforcement bands maintained in concentric alignment by a resilient spacing element positioned between the bands. The method includes the steps of placing the spacing element against the inside face of the outer reinforcement band and compressing the spacing element with a jig, adjacent the top edge of the outer reinforcement band. The spacing element is sufficiently compressed to allow the inner reinforcement band to slide into concentric alignment with the outer reinforcement band, with a minimum of deflection and/or distortion of the inner reinforcement band.

A method is provided for making an annular reinforcement structure having inner and outer reinforcement bands maintained in concentric alignment by a resilient spacing element positioned between the bands. The method includes the steps of placing the spacing element against the inside face of the outer reinforcement band and compressing the spacing element with a jig, adjacent the top edge of the outer reinforcement band. The spacing element is sufficiently compressed to allow the inner reinforcement band to slide into concentric alignment with the outer reinforcement band, with a minimum of deflection and/or distortion of the inner reinforcement band.

Methods, systems, and devices for manufacturing a wearable device are described. Techniques described herein may enable manufacture of wearable devices by vacuum and/or pressure-forming protrusions to cover and protect components (e.g., sensors, charging components) of a wearable device. For example, a moldable material may be heated then vacuum and/or pressure-formed in a mold to form the protrusions. The moldable material may be optically clear (e.g., transparent), a colored translucent, or opaque material. In some examples, the protrusions may be unfilled or may be filled with another optically clear material. For example, a manufacturing process may include fully filling the protrusions with the optically clear material through a hole in the protrusions or a hole in one or more other components of the wearable device. Additionally, or alternatively, the manufacturing process may include partially filling the protrusions with the optically clear material.

Methods, systems, and devices for manufacturing a wearable ring device are described. A printed circuit board (PCB) may be connected to an inner cover, where one or more apertures of the inner cover are aligned with one or more sensors of the PCB. Additionally, an injection molding process may be performed to fill a cavity between the inner cover and a surface of one or more molds with a filler material. The filler material may bind the PCB to the inner cover and fill the one or more apertures with the filler material, creating a ring assembly. Following the injection molding process, an outer cover may be placed around the ring assembly and one or more side covers may engage to secure the inner cover to the outer cover.