Photo of attachment 'lock' on Tree or Gecko?

[ASH1976]

Would anyone be kind enough to provide a close up photo of the attachment 'lock' (for lack of a better word) on either the Tree or the Gecko to the Phantom's little metal bolt in the center of the base?  I am considering making a custom base for the Phantom and will share here if I do. 

Thanks!

Dont have the exact pic of the locking design of the Tree, but i made 2 stainless steel clamps on my base for fitting.   Its not accurate but wouldnt allow the Phantom to be toppled off !!!  if you need the design, let me know!!!!