I posted a while back saying I couldn't make adjustments to my newly purchased (but used) ASM G3. Well I have since managed to get the output tube to slide up and down and it's been about 2 weeks since then. I get decent bubbles, but they aren't quite making it over the cup for the most part. I have to skim pretty wet to get them over so far. It works pretty well when I skim wet, but I'm sure it can skim dry OK and I've just got the water level wrong or something. Any tips?