For some time now I've faced an ongoing annoyance with my raditional anvil hold-downs - youknow, you get the piece one the anvil, set the hold-down and go to work, only to have the work come loose on the second blow.  By the time you get it clamped again, you've lost the heat and have to start over.  This issue cropped up mostly when I was doing chasing or chiseling work, where the work was hit a number of times in rapid succession.  The traditional figure 7 style hold-down just didn't hold tight enough against repetitive blows or much side pressure.  Clearly, I needed a better solution.