# DIY — the brief as pasted (one message, identical for every tool)

My bathroom basin tap is a single-lever mixer, about 10 years old, and it drips from the spout when it's off. I've never done plumbing. Walk me through fixing it myself: what to buy (and what to ask for at a hardware shop in Portugal), the tools, the steps in order, and the point at which I should stop and call a plumber.

**Deviation from the planned protocol:** the plan attached a photo of the operator's own tap. This run was text-only — no photo — so criterion (4), "uses the photo to identify the brand or cartridge type", was not tested. Recorded in the sheet.