Cam Chain Issue?

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Cam Chain Issue?

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I have a CB550 and when I tried to adjust the cam chain, the screw is stuck.  From what I have seen, the screw should not move when turning the nut.  Mine moves with the nut.  I tried holding it with the screwdriver while loosening/tightening the nut but can't keep it stationary.  I am getting a chain rubbing against metal sound from the engine.  Not only that but I cannot get it above 70mph.  At the top of each gear it loses power until I shift up.  Rides fine until it hits the top of the gear and repeats loss of power.

Here is a recording of the sound.

It doesn't seem to capture the sound as accurate as live but hopefully y'all will notice it.

Anything I can do other than take engine out?  Thanks in advance for any help.
American by Birth....TEXAN by the grace of God!  I am the Texas Ambassador to Ohio.

1974 CB750 "La Cabrona"
1977 CB550 "Blue Bonnet"
1982 GL500i "The Grand Old Gal"
2008 CMX250  "The Piglet"