Incidentally, I have to give props here to Paragon Machine Works - they've already arranged for a replacement and created a shipping label.
Mark did make note that these aren't really made for dent removal even though they're popular for the task:
...the tube blocks may incidentally work on dents, but that's not the design. If I were to make a block specifically for dent removal, it would be longer and have 3 to 5 M6 bolts on either side, depending on tube diameter. In any case, leave the bolts out entirely, and use a vise or C-Clamp to apply pressure. Keep the frame tube well lubricated with grease.
I like the sound of that specialized dent remover block.
-Kurt