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Re: Loose A key

Author: clarnibass
Date: 2021-08-16 08:46

Some possible causes:
- Key hinge tube and/or rod screw is bent
- Rust and/or dirt in the hinge/rod
- Friction between spring and surface it slides on (assuming it's a flat spring on that clarinet, very few models have needle springs there) - either from rust, or the spring is digging into the surface (then check if it has sharp end and sides)
- Key binding only when screw is tightened - this happens when the rod screw bends from tightening, either the post face and/or the rod screw relief face are too misaligned
- Hinge tube binding between the posts
- Bent post

It could be more than one thing at the same time.

Oil is pretty much never used to help with binding. It is only for reducing wear and quieting the mechanism (to a certain extend at least).

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