86 has an 80 u00b0 semi circular mounting segment 90 forming its outer periphery extending between the cages 86 and along the entire length of the drum 22 are five ceramic bar magnets 91 also fastened to corresponding segments 90 with screws each magnet 39 s dimensions are again 13 8 34 u00d7 9 16 34 u00d7 40 34 the radius of the segments 90 and the thickness of the magnets 91 are such that the outer surfaces of these magnets are also spaced approximately 1 16 34 from the inner surface of the steel cylinder 25 as further seen in fig3 the cylinder 25 on the drum 21 is spaced a greater distance above the conveyors 12 than the cylinder 25 on the drum 22 the drum 21 spacing in question is 0 56 34 in practice i e where the strips s are 0 006 34 0 014 34 thick in contrast the drum 22 spacing in question is 0 31 34 this spacing variance is achieved by vertical adjustment of the respective shafts 35 on their fixed mountings mounted over each of the four strip conveyors 12 beneath the 180 u00b0 270 u00b0 quadrant of the drum 21 is a bumper assembly 95 as seen.