A device for implant in a hole in cranium relative to a bone table includes a can having an electrical-contact pad. The can has a perimeter edge defining a boundary, and a recessed portion with an upper surface positioned to lie beneath the bone table when the can is placed in the hole. The device also include a cover assembly that couples to and decouples from the can at the electrical-contact pad. A strain relief system includes a lower strain relief and an upper strain relief. The lower strain relief defines channels that receive a portion of a lead and includes a curved portion that extends upward from the upper surface of the recessed portion to the bone table, and a linear portion that extends from the curved portion to an end beyond the perimeter edge. The upper strain relief couples to and decouples from the can and/or the lower strain relief.
