I've got my motor completely apart at my brother's shop and I thought, hey - since its apart maybe I could add this full pressure oil filter I read about. However, when he read it - and looked at my block - he said he can't figure out how the mains will get any oil if you plug the passage to the mains as described in step one. He asked if there was another passage he's not seeing because it looks to him that if he plugs that, its not going to get any oil. Are we missing something, or is this even something that I should be trying (or need to)? I just thought since it was apart I'd try it, but if I don't even need to, maybe its not worth the trouble? Any ideas?