You's so smart, I'll kill you last.I say you just give him the sword so he can make his a full set. Then, he just gives you whatever you need to make your full set. Lastly, give me the set so I can have my full set too! Just cuz I was smart enough to think it up.
If not, I'll give you anything you want for the Swinging Sword. That seems to be the most difficult to find /: