How to repair very deep scratches on a stem?

I need ideas and suggestions on how to repair these really deep scratches. Pictures: http://www.dropbox.com/gallery/15077285/1/Rossin%20stem?h=03c076

The one next to the bolt is atleast 1mm deep and the other is 0,5mm I think.

I dont know how they got there because I bought this Rossin Pista from eBay and the seller did not mention these scratches and the photos where taken at a certain angle so that you could not notice the scratches.

I appreciate any help you can give me!

are you wanting to polihs it again? If so take it to a local welders/fab shop and ask there advice, they may be able to run some weld into the cracks then you/they can sand it down from 120-2000 grit paper then buff it and should be as new

That's pretty crappy service... you should ask for a partial refund or neg them. I sell on ebay and I wouldn't treat anyone like that.

sand paper, then wet and dry, then autosol

Thank you all for your advice!
I finally found some time to work on the stem. I went to my local welders shop and they said that they could repair it, but it was a bit pricy for me. So I took my files and sandpapers and started to mess around. Luckaly all went better than I expected. Now it looks like new. Only if you look really carefully at the bolt you can see that edge next to the bolt is uneaven. Its also a bit flat in that area but it's unnoticeable unless you touch it. I just need to remove some small scratches I missed and buff it up again.
Pics: (the last three ones) https://www.dropbox.com/gallery/15077285/1/Rossin%20stem?h=a1884d

wow, nice job!

looks real good, you have my kudo's

Good work there, I might have to try that with some of my battered stuff

T cut?

Autosol then T-Cut then G-3, for the mirror finish.

Amazing tarts, I have spent hours trying to get minor scratches out of alloy stems, etc.

Thanks guys! I polished with Simichrome. Its hard work and kind of addictive, so right now I'm polishing every aluminium part I have on my bike :/

wow.. still cant figure it out how u can do that,
very vey nice work..

still searching for rossin stem for myself though :( really hard to find
but this really help that to think a scratch up stem can really polished as new..

thanks for the sharing