This happens a lot,in most cases the bolt head exits via the gear case..!!!!I suggest fitting the 2000+ shifter tower (as I have been for months!!!) BEFORE this happens..to be honest, with optics etc I have been able to extract a bolt head but its a PIA,if the gears get jammed NEVER move the car or once the crown wheel moves that bolt head will exit via the castings...!!!

V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!