Point taken...this is why you're a mechanic and I usually don't bother messing (hence the bricking it comment) 
I did use an easy out succesfully on a sheared off duratec cam cover bolt, which was about the size mentioned, difference was these bolts were some blingy anodised metal and soft as cheese (not steel then) and the one that snapped sheared off at way less than the recommended torque setting.
Much swearing ensued, and praying not to get any swarf anywhere bad as the head cover had to come off to drill (lots of plumbers tape used to stop it getting into the head/cam area). All anodised bolts were subsequently cursed at, binned, and stock ones refitted. Lucky/foolish - you can delete as appropriate.

I did use an easy out succesfully on a sheared off duratec cam cover bolt, which was about the size mentioned, difference was these bolts were some blingy anodised metal and soft as cheese (not steel then) and the one that snapped sheared off at way less than the recommended torque setting.
Much swearing ensued, and praying not to get any swarf anywhere bad as the head cover had to come off to drill (lots of plumbers tape used to stop it getting into the head/cam area). All anodised bolts were subsequently cursed at, binned, and stock ones refitted. Lucky/foolish - you can delete as appropriate.


