There is no way to squeeze that clamp shut that I can find. I actually have the correct tool for those kind of clamps, it's an 'OETIKER" brand clamp. The problem is that you just can't get the tool in place to crimp the clamp. I used a small muffler clamp, I think a 1" diameter, not sure. I had to modify the ears on the clamp saddle by shortening them. Then get some locking nuts to replace the ones that come with the clamp, the all metal type stannless if you can get them, not the ones with the nylon insert. Pop the pipe joint apart, put some muffler cement on the joint faces and then assemble. Line up the muffler clamp saddle so that it straddles the joint and tighten slightly, you dont want to crush anything and distort the joint, The saddle of the clamp will keep the joint together. I used this fix on mine about 4 years ago and don't have any leaks yet.