2. Pulling the trigger starts movement of the spindle. The spindle head contacts the end of the sleeve and the blind side bulb starts to form. The sleeve bulbing loads are absorbed internally by the sleeve itself and do not exert delaminating loads on the structure. The pulling head is reacted against the drive washer.
3. The blind side bulb continues to form.
4. Continued motion of the spindle starts pulling the sheets together and forming the blind side bulb. The lock collar starts to enter the lock cavity.