When I was replacing rear sway bar bushings, I broke one of the hex bolts that hold bushing brace, the thread was completely rusted, so I used too much force, ended up breaking the hex head, the thread seized in the bolt which is part of the bracket, the bracket is welded to the frame.

Is there any trick to remove the remove the bolt, drill it? I don't have much experience dealing with steel, would normal drill bit be able to handle Mercedez steel? I now use a C-clamp holding the brace so I can still drive it temporarily.

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.