My Logitech G500 has had the infamous "double click" problem, where you get random double clicks and are unable to drag and drop, for almost a year now. It is a common problem caused by the fact that Logitech opted to use Chinese made Omron D2FC-F-7N switches instead of higher quality Japanese made Omron D2F-01F switches.
There is a way to put some life back into the switches by taking them apart and adjusting the spring inside, but the parts are very delicate and can easily break. I decided I would try to adjust the spring to see how it felt, but after fiddling with it one too many times one of the thin side arms broke on the contact with the spring.
Although I could have replaced the switch with the same Chinese made switch, I opted to upgrade the mouse and get the Japanese made Omron switches instead, and change out the right button too. The D2F-01F switches only cost a dollar or so more than the D2FC-F-7N switches depending on how many you order, and are worth every penny. Once I got the new switches, I could immediately hear a difference in the way they click.
To get the PCB out of the housing I used [URL="https://www.youtube.com/watch?v=KmgcGRcuYtc&spfreload=10"][B]THIS[/B][/URL] guide. Once the PCB was out, I was quickly able to remove the broken switch and solder in the new switch.
Edit: The switch is on a PCB that is soldered to another PCB right below it. This makes it hard to get a soldering iron or desolder gun near the contacts for the switches. If your soldering iron/desolder gun is small enough like mine, you can just get it inbetween the two PCBs and heat up all three contacts to release the switches without touching anything else. If your soldering iron doesn't let you get in there or let you heat up all three contacts, you will have to desolder the connections holding the PCBs together in order to get to the switches. Soldering in the new switches is much easier. /endedit
After I replaced the broken button, I tried the two different buttons out with the housing on to compare them side by side, and the new switch felt much better. The click was a little deeper and the tactile feedback felt more satisfying with the newly installed Japanese switch over the Chinese one.
I finished up by replacing the other button and started putting the whole thing back together. Since the mouse was already open, I also put a couple drops of oil on the scrollwheel axle, making it nearly silent and butter smooth.
After putting it back together the mouse felt awesome, and better yet, no more issues with double clicking or drag and drop.
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Last edited by Oleh; 03-08-2019 at 07:37 AM.