Hey, rexxis, I see you're making ...progress?
Hoo boy, broken bolt removal...
There are several methods going from easy/simple to difficult/expensive
First, pull off the head and cover the cylinder well.
In order:
If any of the threads are grabbable, try removing with pliers
If stiff, try vicegrips
If enuff threads, threadon a nut, flashweld inside nut (heat can help), turn nut
If broken at surface, can try gently tapping around edge of screw with sharp/small punch, when hi enuff, use pliers
If still stuck, carefully/precisely center punch, start with bit 1/2 dia of bolt, drill about 1/4", use ease-out.
If still stuck, drill with left-hand drillbit.
Still stuck, drill to bottom of screw (careful), to reduce bottoming lockup, ease-out again.
If still stuckdrill larger to just below thread tap size, ease-out.
Still stuck, drill to tap size, work-out threads like spring.
Still stuck, drill-out for heli-coil, then heli-coil.
These are not all the tricks, just a simple progression from ahhh to yikes!
I feel like I'm writing an essay for an A&P test...