thanks for all swift responses and wisdoms, forks.
so it seems that another socket is only solution, i guess? running to hardware store, then.
was just wondering any genius heck around it.
another thing worries is the socket driver size, 3/8... let me see what my luck is.

working day, ACE and Home Depot in the city are the pretty much only option i got today.

and yes, the missing one had the perfect 'thin' wall and it's been my major crank bolt tool...
it's from a cheapo C country socket wrench set.