I found another way of drilling out snapped studs. Use a 12.5mm drill bit or ally round bar. Drill a hole of 6.5-7mm to tap it to 8mm, to a depth of 15mm max. Then drill a further 6mm pilot hole through to a depth of around 75mm and cut off to leave a extractor of around 70-75mm long. Put two flats on the 6mm hole end to accept a 10mm spanner. Tighten the 8mm end onto the broken stud with the spanner. Now you can drill straight through the stud in the centre. Then either drill carefully bigger or pick out the threads. Hope the pics work and are more self explanatery than my description.
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