For many years in the computer industry conductive paint has been used on the inside surfaces of plastic enclosures. The conductive paint performs two important functions. One of course is to help prevent build up of static charges of electricity within the enclosure. Two is the conductive paint also has shielding properties to contra; radiation of frequencies that are generated within the devices enclosure. The only shielding superior to the conductive paint is the Faraday cage type but is cost prohibitive in most instances. Nice thing about the conductive paint is total coverage is possible within the dust deputies funnel. Then all that would be required for a total discharge path for the static buildup could be straps around the ends of the funnel to connect the parts of the DD together. Just a thought.