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My keyboard Yamaha S08  suffered from several "sticky keys" disease already a year, perhaps more. That saying, I am pretty bad piano player. However, I like to have my devices fully functional for any cases. I have found a very helpful guide , but with no photos. I made some for better visualization of the repair. First, I unfastened all screws from both sides: Second, I unfastened all screws from a wooden base plate which were holding the part with electronics. Then I unfastened the golden screws holding the whole keyboard to the wood. The keyboard was now accessible from both sides. The last step is described in the following video. It was just removing the sticky keys and reinserting them without a metal spring coming inside. The end of the metal spring has been left outside of the key: So far it works well!

I couldn't find any relevant source for changing the earpads for my favorite mini headphones  AKG K 420  on the web. So I decided to give a short guide how I have done it. I have bought this non-genuine earpad replacement in Media Markt (Vienna) - PUNEX Ersatz Schaumkissen. The size (big) I estimated in the shop and it seems sufficient. 0. Motivation.   For comparison - old and the replaced new one: 1. I took the old earpad off. You can see the gap around the earpad. I didn't want to dismantle it further. 2. Just with my bear hand I put a new earpad on the headphone. 3. But then it looked like this. The earpad didn't fit tightly. 4. So my trick was to use some sharp and very thin knife. I pressed carefully the edge of the earpad inside the gap all around the headphone. And that's that. Happy listening.