Great tip!
In the past I have worn my thick heavy coat onto the plane, and stuffed the large pockets with heavy items such as a desktop hard drive, shoes etc. It's another way to get away with a few kilos of undetectable weight.
Also, can't remember terminal or airline but once at JFK there was a guy checking everyone's carry-ons at the bottom of the escalator before security. I later accidentally discovered an elevator on the other side of the terminal witch takes u straight to security and avoids the strict guy weighing. So always look for another route!