FRAME STRAIGHTENING WORK : Precautions for Frame Repair
To eliminate any residual stress from the frame, always perform hammering during straightening work. This is extremely important because residual stress removal is more difficult in frames than in side members of uni-body vehicles. Any wrinkles generated in the frame and residual stress in the frame must be eliminated by tapping on the applicable portions with a hammer during straightening work.
Complete elimination of residual stress is particularly important for straightening of twisting.