Soooo.... like I mentioned, someone broke the water tube. It broke right beneath the bushing/nut at the top of the lower unit. I looked in the manual, and I looked online, but I can't for the life of me find out how to get the remaining piece out. Can I hammer it out downwards, into the lower unit, or do I have to get a rod and hammer it upwards? I already got the powerhead off. (It was just a little bit heavy.)