Please be aware that this post contains links to items from China or the Far East. You will unlikely have to pay any customs, as they are very cheap items, however you may be waiting up to 6 weeks or even more. If you would rather not wait, please find equivalent items from UK suppliers.
I just fitted some O-Rings to my Corsair K-90 mechanical keyboard, on the recommendation of some people on Hexus Discord quite a while ago. It's been fun and has certainly made an improvement -- though I will need some time to get used to it.
Improvements:
-Softer bottom out of keys
-Much reduced noise
-Plush feeling
-Possibly less strain due to damping effect.
Possible bad points:
-Keys have less travel (or bottom out earlier). Keypresses still well detected.
So if you are interested in a cheap and effective upgrade for your mechanical keyboard here's how! Please note my keyboard is Cherry MX and I am unsure if this will work on other keyboards, however it should as the rings go in the keycaps rather than anything to do with the switches.
You will need:
Keyboard Silicon O-Rings (120 pack) (Aliexpress link)
Key Cap Puller Tool (Gearbest 1 - Gearbest 2) -- I got #2.
Now the process is simple if a little long winded, though you only need do it once. You simply pull up each key in turn and press an o-ring onto (around) the stem of each key (inside the actual key) where the switch meets the key, so that as the key is depressed the o-ring can dampen against the switch/keyboard.
I assume there are lots of YouTube videos out there anyway This is a heads up that this cheap and cheerful upgrade has really improved my old K-90.
Hope you like it!
Millennium.