The Torx threads are internal.. The perimeter is round.

I tried vice grips but there is not enough clearance to attach vice grips to the bold. The manifold clearance on one side and the metal injector lines on the other prevent vice grips in this case....

great points so far... keep 'em comin'

__________________
Mark Herzig
1995 E300D 153K
1985 300D 142K (sold)
1979 450SL 122 miles (sold)
1992 500E 127K (sold)
1987 300SDL 132K (sold)
1986 300E 161K (sold)