The engine in my dad's 300D has a good amount of stretch (can't remember how much ATM but I think it was 6 or more degrees). I know Mercedes recommends using a woodruff key to correct the stretch, but what exactly does that do? Would I still need to time the injection pump if I just put in an offset key?

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.