Before you start looking for the jetpack adjustment tool, you better take a look at this image with the shin tools:
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At some point the best direction for the 4th shin tool was a microphone casing, but we still don't know the right model. I did some research on this and altough I didn't find the actual part, I managed to do some nice comparison images with this tool's variations ==> RafalFett Strikes Back... with the 4th Shin Tool!
I can't wait to see some good images with your Ever Right Minilight in all its glory!