I was sold a cable-driven bath waste and overflow mechanism with my tub, but I'm hesitating to install it because the cable "gearbox" will not be accessible once it's installed. Should it go wrong, I'm not sure I could retrofit any other type of stopper. I also wonder whether it might have a propensity to leak, since the cable or an axle penetrates the pipe. The manufacturer is Westbrass and the model # is D50P27. Has anyone had any experience with type of mechanism?