Weak magnets?

 What to do if the magnets that your dolls came with for their ears are to weak to hold said ears on, especially if this doll is wearing a more voluminous wig? The answer is simple, just sandwich one more strong magnet between the weaker ones. Go for rare earth/neodym magnets as these are extremely strong and choose them similar to the size (or little bigger) of the original magnets your doll came with. Also try to get rather flat ones, as you don't want them to be lifting your dolls wig too much. 

 The extra magnets are supposed to sit under the wig, else you would most likely see them. Then again, if you really have an extra voluminous, curly wig, you might even consider to put them over the wig, so that the ears can still be seen and don't disappear between the curls ;).