Just did this today hope it can help a few people out. The video in the how to is so retarded and guy makes it look too easy.
I'm sure there are a few different ways to do this, but this worked for me. I used a 3/4" piece of electrical conduit cuz thats what i had to give myself some leverage on the clamp, without it good luck ;p Also even the 4" clamp bent, not the threaded side but the actual arm, just a little, i dunno if my clamps were just crap but try and find something heavy duty!! Those were the home depot special irwins. They're crap