Double click caused by spring in mouse switch. This spring can become tired so it isn't providing pressure necessary to maintain connection between two contacts (top, bottom). With combination of dirt, abrasion and oxidation on the contact areas, it is a perfect recipe for unstable connection and unwanted double clicks
Three ways for fix :
- clean contacts and refresh spring
- replace new spring
- replace new switch
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Step 1: Mouse Disassemble
Screw visible at bottom of mouse or sometimes in battery holder or under stickers
Step 2: Open Mouse Switch
Open mouse switch by knife
Step 3: Clean Contacts and Refresh Spring
Depend on abrasion level, you can clean contacts by high grit sandpaper or eraser rubber, wipe, toothbrush, ...
then make spring curve like new spring
Step 4: Replace New Spring
When old spring can't recover, need replace new spring from new mouse switch or limit/endstop switch
Step 5: Replace New Switch
Best way for fix double click is replace new mouse switch, but require your desoldering/soldering tools