Access though the IMS tensioner hole may yield some results, too.
You can tear the engine down "on the half shell" and leave all of bank 1 together, only removing the exhaust cam sprocket bolts, locking the bank 1 cams in place. This allows complete disassembly of bank 2, and access to the IMS region to fetch this fastener, without total engine disassembly.
We do this all the time in development, changing components for back to back tests.
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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