I would do a search - I haven't needed to adjust ours, but those with direct experience have ofter posted here. The modulator is mounted on the side of the tranny, and dropping the tranny from its mount may be necessary to get clearance. The adjustment has nothing to do with varying the vacuum - it allows the modulator to be calibrated.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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