My "Qns & Concerns" is the mechanical design of the other half interface of the device, how is it done so that it satisfies at least these boundary conditions:

• easy to change/snap on
• sturdy enough not to part by itself in normal use
• resistant to wear/breaking when connected/disconnected
• resistant to dirt collecting on the mounting parts and crevices
• If there's electical interface and/or communication interface, its mechanical stability and protection