Bath faucet/shower end replaceable?

[Mainiac]

Our button didn't work to change it to a spray. We kept pushing it but it didn't want push. We took it off and filled it with vinegar and let it sit (I think it was a couple of days before we got back to it). We put it back on, turned on the water, pushed the button. It crunched a few times and started to work. Guess it got a small piece of calcium caught in it. More a problem with the water than the faucet?