ORIGINAL: N429EM
The procedure RCKen has described is right on.
The second picture you have posted is an accident waiting to happen.
The only time you should, ever, reach over a spinning prop, is to remove the glow starter. And, that's only if your plane is firmly restrained.
BTW, you are adjusting the High Speed Needle (HSN).
With all of the JBweld on the other side of the carburetor is it possible for you to adjust the Low Speed Needle (LSN)?
EJ
You and RCKen make a great point . . . SAFETY FIRST . . . and I will not use a tool for the adjustment.
I would never reach over a spinning prop in the manner shown, that was only for the purpose of the photo to show what I thought was a good plan of action.
The carburator/throttle arm broke off and the only thing that would hold is JBweld. And yes, the LSN needle screw moves freely, was very careful in applying the JBweld.