The 2 halves are stuck on the threaded part sticking out the bottom. Back in the day I took a few apart to confirm my diagnosis of a rusted through diaphram/metering plate. At the time there were no repair parts and all manuals I read cautioned against separating the halves. I'm not sure what you hope to accomplish by further dis-assembly. The only internal seals are around the ports in the central metering tube and if they are leaking fuel would be leaking out the bottom of the unit.