I have a 40 or 50 year old home. The (apparently original) bathroom has your basic cast iron tub with three knobs. The diverter has always leaked pretty badly, in that it doesn't divert all the water flow-- all the water stays in the tub, but the shower just doesn't see as much of the diverted flow as it should. I have tried several times to replace the valve stem. I assume the ones I'm being sold are not quite the right ones, though I guess there could be some internal problem. Hot and Cold valves close with no leaks, and replacement valve stems for hot and cold work just fine. The only valve stem I have to match up, therefore, seems to be slightly incorrect. Plumbers I have asked don't want to bother with this, though they'd be happy to rip out the tile and the wall to fix this up for a tidy sum. (Um, no thanks.) Some newer tubs have only hot & cold valves, and a diverter spout (please forgive me if I'm using the wrong terms here) where you pull up a lever and and the tub spout shuts and sends the water flow up to the shower head. Here is my question: What if I just leave the diverter knob set roughly in the middle and switch to a diverter tub spout to turn the shower on and off? Or is there a simple way to remove the valve stem and cap that off if need be? (I suspect such a "fix" would be ugly unless there is cosmetically reasonable part made for this which I have never seen.) I'm concerned that the old valve stem set half-diverted might restrict shower flow... Apart from that, is there some danger in trying this which I might not be foreseeing? What happens if the diverter spout is flipped while the diverter valve is "down" to the tub? Would it just turn off the water, or is that too much force and it could break the spout diverter? What if the diverter knob is set to the shower plus the diverter spout is set to divert to shower? That seems less likely to cause an issue, but Id like to know.... (I have a could of reasonably young kids, so I KNOW at some point they will decide to try what I tell them not to do....) Got any other, simple suggestions? I need a cheap fix here. This is an old bathroom, the goal is functional and not absolutely absurd looking, but I'm dumping a LOT of water down the drain with showers right now-- that seems a terrible waste. Thanks!