That CRIB #60 was quite dated having been published in August of 1994. Toyota has revisited PDR and they have subsequently published CRIB #146.
Quote:
A newly released CRIB, #146, lists the guidelines for performing PDR on Toyota, Scion, and Lexus vehicles. Panels with many dents, such as hail damage, may be considered for PDR as long as the original panel strength is maintained. Dents of up to a softball size in diameter may be considered as long as the damage is at least 50 mm (2") from the edge of the panel or a body feature line. Creases that are up to 100 mm (4") long may also be repairable.
A general overview of the recommendations in the bulletin include:
• inspecting the finish with a 30X magnifying glass to make sure the finish hasn’t been damaged (see Figure 3). If the finish is damaged, refinishing will be required.
taking steps to ensure that the protective coatings in the repair area are not damaged, and that the coatings on the back of the panel are restored, if damaged, following repairs.
• inspecting the panel after the repair with a 30X magnifying glass (see Figure 4) to make sure the flexing of the panel did not exceed the elastic limit of the finish, resulting in micro-cracking and possible delamination. If the finish is damaged during the PDR process, refinishing is required.
Toyota strictly prohibits drilling or cutting panel reinforcements or braces, as well as the use of wedges used to gain access to the backside of the damage. These items may void the manufacturer’s corrosion warranty.