Repairing a Tuscany faucet is by no means rocket science. They are lower-end faucets and are bound to break. If you start to notice water leaking from the handle or inconsistent temperature flow, then the stem inside your faucet is most likely broken. With enough use, the stem of any faucet will eventually wear out. You can easily find a replacement stem for your Tuscany faucet at most major hardware or home improvement stores.
Turn off the shut off valve under the sink, leading to the faucet
Remove your faucet’s handle in order to remove the old, broken stem. If you have a single-handle faucet, you will have to use an Allen wrench to remove the screw at the base of the handle. If you have a double-handle faucet, you will have to use a screwdriver to remove the screw on top of the faucet. First, however, use the screwdriver to pry off the decorative cap that hides this screw.
Remove the screw holding the stem in place (there may or may not be a screw depending on the model of your faucet).
Using a pair of pliers for a better grip, remove the old stem.
Insert the new stem into the body of the faucet, pushing it securely in place.
Reinstall the screw that holds the stem in place (there may or may not be a screw depending on the model of your faucet).
Place the handle back on the faucet, screwing it back in place.
Test the new stem, ensuring that both the hold and cold functions work and there is proper water flow.
Check the threads on the inside of the faucet to make sure they are not stripped.
Make sure to buy a faucet stem specifically for your brand.