Beer Bottle Lock on Quirky!
Due to an overwhelming "can I buy this?" response, I've put the Beer Bottle Lock on Quirky. Please spare 5 seconds and vote for it. If it gets a lot of votes, you'll be able to buy it through the site and I'll get a cut! And I'll buy you a beer... with a lock on it...
Here's the Quirky link: https://www.quirky.com/invent/1529564/action/vote/query/view=trending&categories=all
Here's the instructable: https://www.instructables.com/id/Beer-Bottle-Lock/