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Lubed my sk61 gateron optical yellow switches : r/mkindia
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Gateron Optical Yellow Switches Silver Brown Red Blue Optical Speed Wholesales Switches For SK61 SK64 GK61 GK61 Optical Keyboard - AliExpress
Gateron Mechanical Keyboard Optical Switch for GK61 SK61 White Black Red Brown | eBay
60 Keyboard SK61 New Lite Gasket Quiet Keyboard, Small Mechanical Gaming Keyboard USB Wired with RGB Backlit, NKRO, Water-Resistant, Type-C Cable for Win/Mac/Gaming (Gateron Optical Yellow, Panda) - Newegg.com