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[title] Clean clean clean
[* black] I use the point of the tweezers to brush away any dirt from the center contact inside the button housing.
[* black] I do the same with the back side of the metal disc.
[* black] Finally, I use an air can to blow away any loose debris from inside the button housing. Be careful not to blow away the button plunger.
+[* black] Sometimes, you might see an interior with significant corrosion. You may need to use a cotton swab with isopropyl alcohol or similar fluid to clean the contacts and disc. Just make sure the parts are dry before reassembling.