Our shower knob in the master bathroom was broken but it still workable, you just had to be careful or it would fall off and land in the tub. It was pretty darn annoying, but when I got around to it, when it came to looking on how to replace it, it seemed like I could fix it. All it seemed like you had to do was pop off the plastic cosmetic cap and make sure it had a proper screw. I found a broken and corroded one (thus why it wasn't working) so I got a new one and it worked. I like projects that can be done in five minutes and are extremely inexpensive.