04 225 HO ser #05064973 04 .

I blew my lower unit last year and it was covered by warranty or I would have taken it to gearcaseman(Eddie) so the dealer replaced a few parts (gearcase itself was not damaged) however I changed the oil yesterday(I've made maybe 10 trips on it since rebuild) How much metal should be showing on the magnets? there was quite a bit and I guess I'm getting nervous now.