Wow, that's quite the set there Bob, I've not seen the blue ones before.
I'm really starting to think there was a weakness to the front of these bases though, out of the 10 I've seen with that style of base recently, 6 have had the same gaping hole in the front.
Operationally it's not a real issue due to the second skirt at the front, and for Jeffrey it's not a worry as he knows where to get them repaired, and once restored, I doubt he will be tacking trees with them, Just interesting to note how much that particular damage is popping up!