Logitech G413 - How to fix Roamer-G switches easily and my honest advice on mechanical keyboards 

If you experience double typing and sticking, key press not registering issues.. chances are you might find this helpful. Switches are most likely fine if they work at least partially. It's the film, gunk, oils and oxidation on the contacts.
Also, if your plan to use mechanical keyboard for typing work a lot and have a real concern about sound...just forget them. Check my far from professional sound comparisons in the video within the same environment.
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