Was just wondering if it would be possible to put a metal pickup cover over an EMG HZ or Duncan SSB4 without changing the tone of the pickup. Have been told that you could use aluminum or brass covers and not change the tone. I have a machinist buddy who would make the covers to fit over these pickups,strictly for appearance only, then have them chromed. I just don't like black pickups! Brass or aluminum, being non-magnetic, shouldn't change the tone. Any thoughts or ideas?