A light handlebar mount is shimmed to fit a Blackburn front rack with an Argyle champagne cork.
I also made a Korbel one for a trip down to Sonoma County.
The trick is pretty simple – cut a groove in the cork, tape it to the rack, and mount the light to it as if it were a handlebar. Wrap a little handlebar tape over the rack first, to keep the cork from rotating.
The light on the rack, shimmed with the cork
The (super-heavy lead-acid) battery goes in the Carradice bag. Two toe-straps secure it to the wooden dowel the bag hangs from. Strapping it up like that keeps it from banging around, and seems to take up less room.