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The parts under the plug should be a washer, spring, small pin, steel ball, operating valve long pushrod. The spring fits into the cap plug and the pin fits into the bottom of the spring, the pin sits on top of the steel ball which sits on top of the long pushrod. This assembly rests on the operating lever attached to the shaft that moves when the solenoid lifts or the outside right hand lever is moved manually. The spring provides the return pressure. The operating rod should twist freely and return to rest when released.