I don't know if you've explained this in another thread/post but is there a reason why you're sticking to the Cali emissions carb? You can break these carbs down to 3 basic components without having to strip every screw, linkage and shaft out of them. The only thing you need to do to get there is disconnect a connector linkage or 2 from the throttle/butterfly body to separate them. Give the JY carb a good blasting with carb cleaner and then give the moving linkages and shafts a shot of WD40 and install it. I would use the leaking carb as the 'guinea pig' and attempt the basic breakdown. Once you have familiarised yourself with the fuel float and ball check valves etc reassemble it and break it down again so you know where linkages etc have to go. I wouldn't even attempt to fix the accelerator pump body as the plastic resin wasn't machined in the first place and there are too many things that can go wrong milling such a small area.

Tips - get a nice fresh screwdriver to take the carb apart and before trying to remove the top cover screws, give every screw a light tap with a hammer with the screwdriver as it will help free frozen threads (these carbs are notorious for getting the screw heads chewed out trying to disassemble them) Keep it upright while taking the top cover off and take note of the galleries in the proximity of the accelerator pump as this is where the check ball and brass float is located - disastrous if you lose them. And keep away from crowds/avoid spending non critical time out of your home. Stay safe George!