Wine corks have been featured on Bike Hacks before. A cork can be used to fill a fender gap or to act as a bar end plug. One inventive rider even used a cork puller as a tire sweep/brake.
Near Columbus Circle I spotted a bike with corks as bar end plugs . . .
. . . as well as a seat tube plug. I am inclined to think this is an anti-theft/weather hack. My assumption is the owner takes the seat when parking and plugs the bar end so water does not enter the frame when it rains.
Not sure of the vintage of the liquids digested to complete this hack, but I will just call it a vintage wine hack. The seat tube plug does appear to be of the bubbly variety. If you have found a creative use for cork feel free to contact us.
My customary beverage of choice is beer and thus I am interested to know if anyone has found a bike related use for bottle caps. We have seen beer cans used as fenders and mud flaps, but I do not think I have seen a beer cap hack of any kind. If you have found a use or have witnessed something, give us a shout out.

maybe the bike is actually filled with wine.
Posted by: johnnytrashbike | 08/11/2011 at 09:14 AM
Chateau D'Armstrong
Posted by: jc | 08/11/2011 at 11:14 AM
Bottle Top Hack
http://www.instructables.com/id/Beer-view-mirror/
Posted by: Steve | 08/11/2011 at 03:41 PM
I lost the caps that go on the ends of my crank arms (the little plastic doo-dads that cover the nuts that hold it to the BB) I cut down a couple of beer bottle caps and snapped them in the holes. Its the little things really :)
Posted by: Travis | 08/14/2011 at 10:49 AM
http://www.ninerbikes.com/topcap not really a hack, but kinda cool anyway.
Posted by: T.S. | 08/19/2011 at 11:30 AM
Steve beat me to it. I've been meaning to make one of those beer cap helmet mirrors
Posted by: dan | 08/19/2011 at 05:17 PM