I started with a slight dripping problem(sayko system).i decided to replace all 3 stem assemblies together as they all were about 18 years old.after reassembling the new stems(danko brand),turned on the water supply & checked faucets.hot & cold worked fine but when the shower was turned on,water came out both the shower head & the bottem spout(and i might add fairly strong).any ideas?? and by the way all 3 seats were also replaced.i also tried all old parts & same thing occurs!! is there a special way the divertor valve should be installed??