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52 BODY MANUAL
FIGURE 67
Often a single body jack will provide sufficient pressure
over a small area of damage, Figure 67.
FIGURE 68
Two body jacks are needed to jointly apply pressure to
very large stiff areas which contain direct and indirect
buckles resulting from one impact, Figure 68.
FIGURE 69
In some cases where the damage is confined to a small
area, bar or "C" clamps may be used to place a bulged
panel under constant pressure, Figure 69.
BUMPING
Bumping consists of reshaping each panel to its original
contour.
FIGURE 70
This is accomplished by holding a dolly block (of the
same original contour of the panel being bumped out)
against the LOW spot and striking the HIGH spot with a
hammer. This allows the dolly block to rebound against
the low spot, bringing it back to its approximate original
position, from which the finish bumping operation is
completed.
The hammer and dolly must have broad, smooth faces that will
spread the blows without leaving tool marks. The dolly is the
forming die; therefore, it must have the same contours as the
original, undamaged panel. Figures 70 and 71.
FIGURE 71
Surface blemishes are not removed by bumping; they are re-
moved by metal finishing with a file or torch soldering. Torch
soldering is recommended as filing removes too much metal
unless the dinging (the removal of small dents) has been very
carefully done.
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