I have a McCauley DC 290 governor that has some sort of adjustment on top of it as seen below with the jam nut. I can not find a manual for it on-line and when I contacted McCauley and asked about a manual, there response was to take it to one of the authorized service centers if there were any problems with it. Anyone have any idea what this adjustment is for? The engine is an IO-540 V4A5 that came out of a late model Maule.
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![DSC00629.jpg](/community/proxy.php?image=http%3A%2F%2Fi403.photobucket.com%2Falbums%2Fpp114%2Fdclifford01%2FRV10%2FDSC00629.jpg&hash=4d37afcaf17fe9c60bc2897a2d6669f5)