User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-947751-20121213070112/@comment-4563270-20121213155747

^actually not so illogical my good fellow. HH are very similar to hammers so from a mechanical standpoint i could see that materials you bring to the smith he can use to gut a hammer and turn it into a hunting hor and vice versa and prehaps when making a switch axe they start out making a great sword and then break it up so it can shift between an axe and a sword and attach the phial. i would say the best conversion of weapons would be like so.

lance->charge axe->sns->ds

gl->lance

HH->hammer

lance->gl->bowgun->bow

ds->ls->gs->switch axe->charge axe->sns->lance->gl and repeat web above

charge axe->ls->bug staff

bug staff->ls->charge axe->lance->gl

stuff like that.