I am moving in to a place with an old shower faucet. The knob turns one way for cold and the other way for hot and off is somewhere in the middle. Is this right? I’d like to have it so I can just turn it all the way to one side for off instead of trying to find the sweet spot in the middle. What are my replacement options and what kind of cost am I looking at? Links to products or videos would be helpful...not necessarily going to do this myself though. Thank you!