Having had both square and round Martin cages (sold them for more than $1000.00 each) I can tell you the Owen cage, when "broken in" will be as good as you can get.
Read Tommy Wonder on the take up pull.
Ken Brooke marketed a "copy" of the Martin Pull made by George Hammerton.
However... I invented a pull that, when you finish vanishing the cage, you can dump cage and pull and are completely searchable.
First magician I ever saw, as a kid, was Steve Shepherd, who vanished the cage, then stripped to his shorts. It reads dumb but was a great club date act, believe me.
You don't need the locking square if you have the cage in a box you can take it out (slot for pull attachment) the only trouble is you need to HOOK UP... if you have it in your sleeve ahead of time you can reach into a table or go off to "get something"...
but my pull allows you to dump it.
What is is? A single looooong catgut loop. Goes from cage, up sleeve, across back, down sleeve and just loops around your thumb.
When done, reach into bag let cage fall out and pull loop.
Norm Nielsen sells best fake bird.
let us know how you do. :genii: