Most novices hit the dolly. The Bible preaches: Strike 1/4 inch beside the dolly. The dolly acts as a backup anvil. The hammer head pushes the metal down; the dolly springs it back to neutral. The update includes QR codes (in the PDF) linking to slow-motion audio clips of the correct "ring" versus the dead "thud" of a wrong hit.

Enter the .

Below is a structured feature article covering the essentials of metal bumping, including key techniques, tools, and why this skill is considered the "bible" of auto body repair.

Including the "toe," "heel," and "comma" shapes to match the various contours of a car body.

The PDF dedicates 40 pages to this. There are 50 types of hammers; you only need 4.