This Neat Little Tool...

I'm not sure what this thing is called, but I have only ever seen two of them in my career.  They don't seem to be as common as I think they should be, but this little tool pictured below will help you get those pesky little clips in so that you screw your network gear into the racks.  Literally, it takes less than a second to get these clips in.  All it is really is just a piece of metal shaped in such a way to slip in between the rack post and clip to where is pinches the clip brace for you.  Really good idea by someone.  Someone who got tired of trying to deal with those clips no doubt.

These are the clips Im talking about:

Ok, so I couldn't demonstrate this by myself, but I'm trying to convey how this thing works in the below picture.  Just pull the tool through.