Fixes to 4522 Minifig hammer

[N. W. Perry]

I think there are some wrong dimensions on part 4522. Based on its use in set 10185 (see image), I propose that the head should be an even 12 LDU wide, instead of 12.5. And it should probably be centered on the handle, so it protrudes 8 LDU on either side (right now it's ~8.5 and 7.5).

Does anyone know of any other uses that would support (or refute) these adjustments?