The cam mechanism is junk. It's too sophisticated for what they charge. It it were made to work reliably, it would cost much more.I followed all the instructions, and last step is insert the cam. It wouldn't thread on. Finally I got one to thread on, but then it wouldn't thread back off. IT WON'T THREAD BACK OFF! It won't snug up, and won't come back off either! Too many reviews say this to not be true! I had to cut the exposed section and remove with vise grips. Praise to the DIY gods It wasn'tSee full review