If you really want to see if the spray bar/needle is blocked there is a lot easier way than taking everything apart. Open the carb all the way, turn the plane into such a position that the carb air inlet faces down (to avoid flooding) connect a fuel line from a hand pump to the carb fuel inlet and start pumping. Fuel should come pouring out of the carb. If not, either it is blocked or the needle is closed. Don't take stuff apart if you don't have to. Just one more oportunity to screw something up.