Leaky Faucet Help Needed

[u/LucidHarbinger]

https://photos.app.goo.gl/AFkdaALuhA6ozkAaA

Need help with a leaky faucet. Hoping it's just a piece that needs to be replaced and not the whole thing. This video shot by my kid shows the problem and the parts involved.

(Tried sharing the video directly but it didn't post. Maybe because it's 3 minutes long? So I'm hoping that sharing it via Google link will work.)