## Neighborhood Tool Collective
A building-block-level tool sharing network running on the deposit model used by German bottle returns.
### Core Concept
1. Each participating building appoints a **Werkzeug-Wart** (tool guardian) — typically someone already hoarding too many tools.
2. Tools are registered in a shared spreadsheet (or a Matrix/Signal group for tech-forward streets).
3. Borrowing: leave a €10–50 deposit matching tool value, get the tool, return within 48h, deposit returned.
4. No app needed. No liability beyond the deposit.
### Why the deposit model works
- The Pfand system has been proven at scale in Germany for 40 years.
- Zero-overhead for the guardian: just accept/return deposits and tools.
- Self-regulating: borrowers return tools because money is at stake.
### Rollout plan
1. Hang a laminated "Werkzeug-Bibliothek" sign in the building entrance.
2. Start with 5–10 tools. Drill, saw, level, tile cutter, wallpaper steamer.
3. Expand based on demand. Add Vereinsmodell (registered club) only if > 20 participants want formal structure.
### Evidence base
Real-world precedents: Leila (Berlin), Pumpipumpe (Switzerland), Tool Library Edinburgh. All prove the model scales to 100+ members with zero full-time staff.
