thank you! i only needed to open and clean the dust inside and it clicks well again.
mine was double clicking when i click and hold.
was about to unsolder and swap the left and right switches but didn't have to go all the way there.
screws are fine i think. just be careful and put them on a safe place with the same relative positions to make it easier to put back, as with all other devices when disassembling.

UPDATE: mine is double clicking again 1 month later, and just found out recently from reddit that breathing humidity to the switches will often fix the double clicking problem with these Omron switches inside. it's magic! i tried and it really fixed it.