Reassemble Stem and Tighten Packing Nut

What happens here

Carefully reinsert the entire faucet stem assembly, with the new washer and packing, back into the faucet body. Make sure it slides in smoothly and aligns properly. Once the stem is in place, thread the packing nut back onto the faucet body by hand first, to avoid cross-threading. Then, use your adjustable pliers or wrench to tighten the packing nut. It's important not to overtighten it initially; tighten it until it's snug. The video emphasizes not to overtighten, as it's a packing nut and can be adjusted later. The packing material will compress, forming a seal. You can always tighten it a little more if a leak persists after turning the water back on.

Goal: Secure the faucet stem and create a seal