The set screw is in a place that a tool can not get to. I took a good look as I finished disassembling an engine today. Even with the head off and chain ramps removed, it didn't seem doable.
So, how about moving it to out of the IMS pit with a jet of air or fluid. You can push flexible tubing down there. If you can get the set screw to another spot, you have a much better chance of reaching it.
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