the little piece of possible shrapnel on the magnet with no other iron filings stuck to the magnet is likely not a big deal as others have said. it was the oil pressure problem that is more worrisome. that was what brought me to consider the metal flap in the oil filter adaptor as a possible cause of the oil pressure problem and the chunk of metal. you have not mentioned that since the original post. is it better, the the same or worse since you have done the flushes etc?