Years ago when working on 4 and 5cyl diesels I cut approx. 1" off of the long side of a 6mm allen wrench. In instances where there is very little vertical clearance (like 126 V8 motor mount bolts hiding under the engine mounting arms) I insert the 1" 6mm allen wrench into the head of the bolt and use either the box end or open end of a 6mm wrench to turn the stub wrench. Once broken loose one can usually finish removing the bolt by turning the allen stub wrench. The craftsman tool shown in the previous post should take the place of the 6 mm box end wrench provided you obtain a very short allen socket. One other hint, always be sure to use a pick or other suitable tool to clean out any crud from each allen bolt prior to loosening to prevent stripping the head of the bolt. Mark