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Distinguished Technician & SOTW Columnist. RIP, Yo
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17,204 Posts
It could also be excessive friction between the octave key and the arm that operates it. Rub the side of your nose for some grease, and apply that to the surfaces.
Be aware that octave mechanisms are quite complicated, eg one spring having to overpower another.
When they are altered it needs to be done with considerable understanding of how the particular mechanism works. (It appears your technician may not have fully understood.)
There should be no detectable friction anywhere in the many contact points, including pivots.
 

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Distinguished Technician & SOTW Columnist. RIP, Yo
Joined
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17,204 Posts
Don't forget to clean the barrel! ...
I don't like the term "barrel".
That that is because here we don't have a gun culture, but do have a beer culture.
So "barrel" refers to something with a bulge around it's waist. That is not the case for these hinge thingies. Haha
 
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