Did you have to press on the side plate or did it just slip on--makes a difference
I had to press the side plate. I used a C clamp with a nut to allow the post to protrude. Then I hung the closed end on the front post and swiveled the open end over the back post. I used a slotted screw driver to get the open end over the post and it seems to clip right in.
Seems very secure, but I am still considering buying a rivet tool and replacing the clip master link with a riveted master link.
Although it seems that you have to mash the rivet down just the right amount to get it installed properly.