you can buy a borescope at HF for about $60. once you know exactly where it is, removing it will be much easier.
i bought one to verify a coolant leak in my Department Of Boost custom intake manifold for my mustang. they work pretty good, run on 4 AA batteries.
Evidently he knows exactly where it is,just can't get it out.Also,still can't get over worrying about something that really doesn't matter unless that is the only 7/16" wrench you own!