This has probably been touched on before but I can't seem to find it in the threads. I've been lazy cleaning my tunze 6100 and now the impeller shaft is stuck in the body. anyone have any ideas on how to get it out. I've trying pulling straight out fairly hard but no dice. if i pull too much harder i'm afraid i'll break it. I'm going to let the whole thing sit in a vinegar soak overnight and try again in the morning...other than that i'm stumped...