Per request here are some additional photos and detail on the method.
Dent puller as sold:
Arrangement of the removable tip:
Tip removed, matching bolt (5/16" by 1 1/2" hex head and nut) and the extracted pilot bushing for comparison:
Hex bolt head didn't quite fit until the corners of the hex were lightly ground.https://lh5.googleusercontent.com/--mhiFXYJAY4/Ti9XEr3743I/AAAAAAAAH-c/DeXSvDKm1Zs/s640/4%252520P1020099.JPG
Note that the bolt must be at least 1.5 " so that the head lops over the edge of the bushing before the nut hits the leading edge:
After pulling it out. Note how the hex head catches the back edge of the bushing. Because it has to slip inside, it only grabs one edge at any time, so I moved it around as I hammered it out so that the bushing wouldn't get cocked.
Closeup showing the rounded hex shoulders to get it into the bore.
Hope that helps.