What's the dealio with this disc adaptor?

finbar

Retro Guru
Can anyone help explain how this thing works please? Specifically how it interacts with the hub and rear dropout? It seems like you have to replace a cone or something to fit it... :?: :?:

Thank you :D

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Thanks, but I was hoping to put this on my commuter - which definitely doesn't warrant a new wheel build...
 
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