1.   For thick bolts, it may be easier to first split the bolt head.

2.   Matching the nut shape to the shape of the bolt head is more a matter of esthetics than function.

3.   There are bolt heads everywhere in the movie, so the bathroom is studded with a hundred or more that she cast from plaster.

4.   When joining wood it is a good idea to use a washer to back up the bolt head, as well.