James Cobb asks:
> I'm a little confused as to whether or not it goes
> directly on the derailleur hanger or on an extension.
> The Basso has its own brand of dropout, but there's
> nothing unusual about the design.
I'll go right on your Basso dropout. It can also go on an extension (sometimes called a "claw" due to the shape), for bikes where the dropout doesn't have the derailleur hanger built in.