The worst has happened. After very patiently removing the nuts and bolts on my wbx I twisted 2 off and still have 1 to go. They are flush with the head and have nothing to grab onto. What are my options with out removing the head. They are obviously not grade 5 or 8, but good old garbage grade 2 considering they twisted off with a minimum amount off force. Is it possible to helicoil these while in the van?