Just been trying to make my Comet Faster,I blame that Greg!! Looking down I saw the top gearbox fixing bolt, The big one that goes at the bottom of F106, The head looked , Not flat ! I bought it some years ago, I think as stainless, As you know the standard one is a Stud with a nut brazed on, I changed a few bits to make it more Shiney, Can't remember where I got it from, The nut is not Magnetic, Stainless ? But the stud is, But it has that stainless look about it ! Something Funny is afoot !! Cheers Bill.