</font><font color="blue" class="small">( While I agree they may not look too good I did take a 5lb hammer to them last night and couldn't knock them off.)</font>
Good. Now, don't hold me to it, since I've slept since then, but I believe in a college physics class we found that an average hit with a 3 pound sledge hammer could exert a force of nearly 600 pounds, and a 5 pound hammer could exert a force of over 800 pounds. Sorry, but for the life of me I just can't recall that formula and I certainly don't have that machine that we were whacking in college. I do recall that with a 12 pound sledge, and a complete overhead swing (also, at the time I was bench pressing almost 400 pounds) I think I could well exceed 2000 pounds of force (tops on that machine); and damaged their machine. /forums/images/graemlins/blush.gif
So, from what you've tried, I doubt that you will pull a hook off on a steady pull (depending on the angle), but please still do be careful about making sure that nobody will get hurt if one does let loose. I had one come off years ago and fortunately nobody was hurt. But, if it came off a few minutes earlier, it would have been a disaster. The grab hook looked fine, and there was a perfect "seat" for the hook still welded on the bucket. My weld was too cold and did not penetrate the hardened hook. I could actually put the hook back inside the welded seat, tap it in with a hammer, and it looked like it was fixed. /forums/images/graemlins/tongue.gif Obviously not. At that point, I swallowed my pride (sometimes it's a big lump for me /forums/images/graemlins/crazy.gif) and had my dad come over and weld them all back on after I ground them off. So, now you know the embarrassing basis for my warning to be careful. /forums/images/graemlins/smile.gif