Not on all WW, 2 barrel carburetors. Most likely on automatic transmission types only.
Place metering pin #3 in side hole of push rod. Insert push rod in hole of housing and align diaphragm with housing.
Place large diameter end of spring #4 on diaphragm plate, then assemble rear housing and replace attaching screws #6.
Insert check ball #1 in housing and replace drive plug.
Insert stem end of plunger #5 in housing, place plunger spring in magnet and assemble gasket & magnet on housing. Securely tighten screws.
Place bracket #2 on housing, as shown, replace lock washer, sleeve nut, spring and adjusting screw.