Leak contained by tub after repairs but solely after its be over tightened? We had the bathroom remodeled almost 10 or so years ago....

We had the bathroom remodeled almost 10 or so years ago. Since then, we hold fixed the leaky tub about 6 times or so. I merely fixed it 2 weeks ago, and just similar to every other time that it was fixed, it leak again. I always put the dated worn gaskets and the part that the gasket rubs on when it shuts the dampen off, if needed,, next to new ones. It works fine for a while. The channel this works is, you shower and you turn the middle valve past its sell-by date, then the hose down starts running out the bottom. you then turn the 2 sides bad. I dont turn them all the agency until they dont turn anymore, just untill the wet starts dripping. After a few seconds, the hose stops completely. But we sometimes have company who dont know thats how it works and they over tighten until it wont go anymore and if I put it pay for to where it be originaly, it leaks. After overtightening it so frequent times, it will just drip no business how hard you close the tap. Can this be fixed so anyone can work, even if they try to overtighten?
Answers:    Ok...u got the type that the washer and places have to be replace respectively time. The people other over tighten the handle and mess up the washer and crush the form. The Worse type of shower faucet u can buy. I usually recommend Delta or Moen or American Standard...It's Less head Ache and LAST longer. U must remind the guest that respectively time they use it DON'T over tighten- let the system drain the hose down from the shower head (10 sec) If the center stem leak...u must change the diverter washer also. If u don't want that skipper Ache...change to the Brand I mentioned. Master Plumber Moon J
There should be rubber gaskets surrounded by each spout that are replaceable in most applications however getting to the buggers is going to be difficult at best. They can be access by first removing the handles, the showy trim around the stems and you'll see a nut looking thing on the stopcock stem. Loosen it and you'll be able to see the gaskets which can be replaced by purchasing a adjectives box of assorted gaskets from most any home repair store.