Hi, I've been working on an instrument, and for a while, something has just sounded "off"about it. Out of curiosity, I touched a strong magnet to each individual pole piece to see if they had the same polarity. Two of them (numbers 1 and 3) repelled the side of the magnet that all the others had attracted. So, is this normal? Or should the pole pieces all have the same polarity? If so, can it change over time, or was there probably something wrong with the pickup from the factory? Thanks!