'74 240D IP timing

[85chedeng300D]

Once again, is there anybody there who knows the procedure of how to properly time the IP on a '74 240D with 616.916 engine and 115.117 chassis? A good friend of mine replaced a bad/failed IP with a new one and coudn't start the engine anymore. From my research on this Diesel Forum, there is a "locking nut/tool" required to accomplish this job, and obviously, my friend didn't used one. Are there any alternatives for this step? Any source for this special tool? Any part #? How does this tool works? Our local MB dealership is not generous enough, or I would say not cooperative at all to share some knowledge on this procedure. All they want and care is to milk our pockets. Any help and input will be greatly appreciated.