I have two Zenith 35/40 INAT carbuetors to rebuild. While disassembling the first one, I had no problem until I tried to seperate the top section from the float boal section. I have re, re, re confirmed that I have removed all the screws, but they will not come apart? I tried using a little extra force by tapping a flat blade screw driver inbetween, and lightly prying...did not work. I am real hesitant to pry harder and possibly break the sections. Is there some trick to seperating these sections? Thank you in advance.