The problem? The original scans were grainy, the photographs dated, and the techniques assumed you had a forge and a lead wiping torch. The industry evolved to PDR (Paintless Dent Repair) and glue pulling, but the core physics remained untouched.
The manual serves as a guide for selecting and using the right specialized hand tools Dolly Blocks : Heavy metal blocks used behind the panel to support it
Here are some common techniques and methods used in metal bumping: The problem
You do not need a $10,000 Pullmax machine. The key to metal bumping is human feel. Based on the updated recommendations:
The metal bends but returns to its original shape when the force is removed. The manual serves as a guide for selecting
Originally written in the mid-20th century by Frank T. Sargent, this manual is considered the "bible" of panel beating. While modern collision repair relies heavily on replacing damaged components with new OEM panels, classic car restoration and high-end custom fabrication demand the preservation of original metal.
Never strike the center of the dent first. Start by using the hammer-off-dolly technique on the outer ridges to release the tension locking the dent in place. Often, the center will pop back out on its own once the perimeter tension is freed. Originally written in the mid-20th century by Frank T
Draw your body file diagonally across the repair. Sand with 80-grit on a soft block. Apply a thin skim coat of glazing putty ONLY if you see lows under a spotlight. Ideally, you will have a metal-finish ready for epoxy primer.
Use very light taps to avoid thinning and stretching the metal. Large flat areas (doors/hoods) Prevents the tool marks commonly left by standard hammers. Thermal Shrinking Fixing oil-canning / stretched metal Cool the metal rapidly to lock the structural shrinkage. If you want to refine your workshop setup, let me know: