If u got the snapped bit still.... Industrial super glu or liquid metal but I'd go for the super glue as it wont seep out so much when u hold it to dry. (And if u get the proper stuff "CA" from a modelling shop it will dry VERY QUICK) if of course u ask for the quick dryin stuff lol but if manage to foc it up new lock for 20 quidish.
Just flapping about on this stagnant little pond on the outer rim of the internet.....yup.... :-))