Author: clarnibass
Date: 2017-04-16 09:57
For every key that is sluggish, first check that it is smooth without the spring. Sometimes it's tricky and you have to sort of press the spring away so it doesn't touch the hinge anywhere. If the key is slightly binding without the spring it's very different from the spring being sluggish.
The former can be a result of a bent rod screw and/or hinge tube, misaligned or loose post, rust, bent pivot screw, pivot screw going too deep into the ends of hinge rods, and many other reasons.
Once you eliminate all of those, it could be the spring itself. Things like friction between the spring and the cradle, bad spring (material, not springy enough, bad length and/or thickness, etc.). Sometimes a post is loose but will move out of alignment only when you put the spring in the cradle, pushing it to the side. Rust can cause friction, especially for flat springs. For flat springs, sometimes they dig into the body (or metal plate if there is one) which causes this (it's often good to remove sharp edges from flat springs which helps prevent this in the future).
It could have been this way when it was made, but who knows, maybe someone replaced all springs with low quality springs at some point and you might have to replace them all to fix it.
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