The door of durin.

[Kransha]

Well, the doors were made mostly by Narvi, an elf I believe (this may be wrong). Either way, Narvi was enlisted as a crafstmen by Durin III, but was a close friend of ol' Celebrimbor. I suppose that the dwarf/elf feud was just not as feudy at this time, since Durin must have associated with them slightly. Imean, remember that Celebrimbor of Hollin drew the exquisite designs on the doors, and he was most certainly and elf.

Actually, I believe this is the explanation for the fued (really more of a whacked theory). Think about this, ponder if you will, my explanation for why dwarves and elves hate each other so much.

Narvi, for the sake of art, crafted the West-door of Khazad-dum with elvish inscriptions. That inscription read, I believe...

The Doors of Durin, Lord of Moria. Speak, friend, and enter.

Now, that's fine and dandy. Nice concise description. But, one must note one thing. The dwarves did not like Khazad-dum, their beautiful home, being called something so derogatory as Black Pit, Moria. So, why did they let it happen? Simple: Narvi and Celebrimbor thought it would be a fun practical joke to play on the dwarves, permanently inscribing a disliked name on their front door right under their beards (they could only read Cirth, as I remember). When Durin found this out, he must've been rather put off, thus beginning the ageless feud between wee axe wielding beardies and pointy-eared folk.