Originally Posted by Lexxani

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.