After reading all the reviews on this product, one thing became clear. Sam S.'s review hit me in the head. This adapter was too rigid, to the point of brittleness! I took his advice and reduced the hardness slightly by heating it to a cherry red color for about 15 seconds and letting it cool to room temperature. I banged this adapter mercilessly with my CP717 air hammer for at least 1/2 hour with no problems and have used it many times since. I don't see any signs of it being damaged or "knocked out of shape". So this is a great tool if you need such an adapter. Great tool, great idea.