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A common cause of a leaky faucet is a damaged washer or cartridge. Replacing these components can often solve the problem. Replacing the entire faucet assembly is a more drastic and expensive solution and may not be necessary. Tightening the faucet handle may not fix the leak if the issue is with the washer or cartridge. Using duct tape to seal the leak is a temporary and not a proper fix, and it may not address the underlying problem.