Stackable unit washer in my apartment has the Housing dispenser in the agitator loose and when it runs it falls off the tower. The cup dispenser has a broken foot so it will have to be replaced but the housing does not appear to be damaged and it is not obvious what holds it on the agitator tower. Any comments are appreciated?

Thanks for the reply I tried to just put it back on, it seats easily without any resistance so if it was supposed to snap on, the snapper must also be shot. I am going to an appliance store today and check out the new models to get an idea how it appears to work.