One key C3 Makes a metalic spring noise.

[Shheo]

I bought keylab 49 Mk2 and there is a metalic springy noise in one key in middle of the keyboard C3. How can i fix this? The sounds seems like it the key is catched by something.. here is the video. https://youtu.be/RsKvhW4rgJ8

[KMR1977]

I remember someone posted a video about how to fix a problem similar to yours.  Try searching the forum for "noisy key Keylab MKII."