Beater bike or not, if you don't have sense enough to put on the right sized chain, then you don't know what the hell you are doing.

Not only were you riding unsafely, you WASTED your Dura Ace chainring AND your current chain by subjecting them both premature wear instead of installing the right $10 chain.

A "beater bike" is not a piece of crap bike that barely functions. It's a bike made of mis-matched parts that is in good and safe working order.

If you are so proud that you know what you are doing...let's see the rest of the bike. I can only assume that you have a 1/8" cog, too.