[TowerTalk] F-12 Drop in cradle mount

[Jim Thomson]

I see that F-12 uses a..... 'drop- in cradle  mount'  on some of their bigger ants.  I can sorta envision what this looks like.
Can anybody describe it ?     I'd love to see a close up pix of one.   I know what their ..'easy on'  boom to mast double plate set up 
looks like, I have several of them, and fabricated a few of my own. 

I think the drop-in cradle is sorta like a shelf arrangement ?   Dunno why F-12  has never had pix of the drop-in cradle  before. 
Can they be used on a 2" mast ?     Will they work any better than a heavy duty version of an...  'easy on'  double plate ? 

Thanks.... Jim    VE7RF