The knob works, it fills, when it goes to agitate it doesn't. However you can hear the timer running and it will finish the cycle. But if I pull the knob out further it comes to life. I can spin it and get it to work sometimes. The Delicate cycle works fine, because I use it much less.Seems it just won't stay popped out enough, just worn out. Any suggestions as to what part should be replaced?

Thanks!
Mary