I have tried Cobalt drills with no success. Thanks for the link, but carriage from the US is a killer.Perhaps a carbide spade drill would work for you. I use them on hard steel. Works best with Tap Magic EP-Xtra cutting fluid .
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The top picture is of a carbide Masonary or brick bit. It has a piece of carbide brazed or silver soldered on to a twist drill. It is commonly used in hammer drills or hand drills.
The next pictures are of a solid carbide spade drill bit. They are usually only 2-3 inches long. When used with the previously mentioned cutting oil you can drill through damn near anything. I used 3/8 bits just because you can see the difference easier. I know your pins are much smaller than that.
If I can help get them to you in anyway, please PM me.
Regards Brian