Brush assembly

A brush assembly comprising:

• a housing including a first opening, a second opening, and an interior space defined between the first opening and the second opening;
• wherein the housing includes an adjustable mount;
• a removable cover at least partially received within the interior space and covering the first opening;
• a brush at least partially received within the interior space and extending from the second opening, the brush operable to move between an extended position and a retracted position, wherein more of the brush is received within the interior space in the retracted position than in the extended position;
• wherein the brush is formed from silver graphite;
• a contact received within a mounting aperture formed in the removable cover, the contact electrically connected to the brush,
• a constant-force spring coupled to the removable cover, the spring biasing the brush into the extended position;
• wherein a grounding circuit is formed between the brush and the contact and the grounding circuit is insulated by the holder and the removable cover.