[TR] removing a broken bolt

[terryrs at comcast.net]

Yeesh.  Sometimes no matter how careful....
Carefully ratcheted the timing cover pedestal into the block when at "snug" the head twisted off.  Block was cold, pedestal 55 years old and may have been overtightened before...whatever.
Now I need to get it out.  Never had luck with curl-shank easy-outs.  Thought of drilling a hole and using a left-hand tap, then a left hand bolt to remove.  Any other thoughts?

Terry Smith, '59 TR3A
New Hampshire