I mentioned this to Vynmylak months ago and he said he would change it, but I think it got lost in the shuffle:

To get a hammer, you have to "call lightforge mace". If you try "call lightforge hammer" you get "You cannot for light into that!" or something like that.

Considering you are making a hammer, deliberately, and it is never a mace, you might want to let people use the keyword hammer when creating.