When You Don't Have The Time, The Know How, Or The Want To
Plumbing fixtures are often guaranteed for 10 years or more.
The major manufacturers have 800 numbers for technical support and/or parts replacement. The majority of the time that folks need these numbers, they can't find them, (their on the box that you threw away). Some of them, of the time, will help you diagnose your problem and will send you an amazing array of repair parts free.
If you have to pay, you will be sure you're using authentic factory parts, and the price & shipping costs are not unreasonable. If you can wait for the parts to arrive, (i.e. water isn't spewing out everywhere), you may want to give them a call and try to correct the problem yourself. One thing that you gave to keep in mind, the folks answering the phone are not plumbers. They may know as much, (or less), about a particular product than you do.
Also, all of the major brands, Delta, Moen, Price Pfister, etc... usually have 3brands of their product lines. The low ends are obviously the least expensive. The high ends are usually solid brass, (you could use a sprayer on a kitchen faucet for a weapon). A lot of them look the same, the difference is in the quality of the materials used for construction.
Like my Dad used to say, if it's heavy, it's expensive.