thats really strange that you've had that experience. When I did mine in my m117 the head bolts came loose with a little pressure from a 1/2 inch bar and a high quality bit. I used an air ratchet to pull them quickly, but I broke them free by hand.

I did buy the $28 tool from mercedes as it was the only way to get at the right bank rears as the brake booster was in my way, worked like a charm.

I think if you used a non impact bit on your gun and turned the psi down a little bit (id try 60psi and make incremental adjustments from there) you should be in a better position.

__________________
". . .back before accountants designed cars"

-Current Stable-
'78 MB 450SL-C 107.024.12.020783 #3840 <Kayleen>
'85 FORD F250 6.9L Diesel <Allison>
'98 Lexus ES300 <Rachel>
Long Gone...
'74 Chevy G10...........................'99 GMC Yukon 4X4
'83 Chevy Suburban 6.2 diesel .....'99 SAAB 9-5
'90 Mitsubishi Eclipse GS............. '01 Chevy Tahoe
'98 Nissan Altima .......................'02 MB ML320
'88 Chevy Suburban V2500 4X4 6.2 diesel