what's the torque rating on your impact wrench and where did u get the socket? i'd get some heavy duty sockets and turn that impact gun loose.

if you were nearby i'd be more than happy to let you use my Milwaukee impact gun w/ 330lb ft of torque

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Current cars:
2001 MB E55 AMG
2003 Honda S2000
2000 Honda CRV

Gone but not forgotten:
2004 BMW 325i 5sp sport
1999 BMW 540i sport
1997 MB E420
1995 BMW M3 coupe