Companions Wuuthrad quest.

I started this quest too early, I got one piece of the axe Wuuthrad with Farkas I think, got killed too often in the Silver Hand dungeon at Gallows Rock, and gave up. Now I'd like to get inside Ysgamor's tomb but I'm not sure how many pieces I have left and I did Gallows Rock but there was no piece there. I see that I did the first quest, but I'm not sure if somehow I restart it or if I haven't understood the quest line.