The Key To Metal Bumping Panel Beating Auto Body Repair Biblepdf Upd _verified_ May 2026
The Key to Metal Bumping " is a legendary 126-page instruction manual written by Frank T. Sargent that serves as a fundamental "bible" for auto body repair and metalwork. First published in the late 1930s, this manual is highly regarded for teaching the core principles of panel beating and damage analysis, specifically how to "unlock" creases by understanding metal stress and elastic limits. Core Principles of Metal Bumping
- On HSS (High Strength Steel), using heat is forbidden. The PDF provides a chart of pull heights versus stud types.
- The Key: After pulling a stud, you must peen the area around the stud mark to relieve the raised crater. Most techs skip this—it’s why their work sinks after painting.
- Heat shrinking (oxy-acetylene): heat a small red spot, quench with wet rag.
- Cold shrinking (shrinking disc): friction heats small areas; cool with water.
- Tucking (hammer-on-dolly edge) for mild stretch.
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