Ok, I did some more testing yesterday. It works! It was removing about 14 out of 15 nails, with the 15th getting it's head ripped off. What I discovered is that you really need a 10 lb slide hammer. I have been using a 5 lb slide hammer. And you should use a decent quality one. My cheap 5lb'er has a plastic base for end handle which cracked. This is a Cheap Taiwan tool(which I bought in the late 80's before China became the major supplier of low quality tools). I have a high quality old 10 lb slide hammer that I am now going to convert for permanent use with this nail puller. Brad