MX Stem
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MX Keycap Dimensions: Footprint, Stem Socket and Height
MX keycap dimensions in mm: about 18 mm base on a 19.05 mm grid, a 4.1 mm cross socket with 1.17 mm arms, and profile heights from 7.4 to 16.5 mm.
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Keycap Sizes Chart: 1u, Space Bar and Kit Dimensions in mm
Keycap sizes in mm, cm and units: a 1u cap is about 18 mm on a 19.05 mm grid, a 6.25u space bar is 118 mm, plus the bottom-row checks before buying.
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How to Fix Keycap Wobble and Loose Keycaps
Diagnose and fix a loose or wobbling keycap by checking the cap socket, switch stem, plate seating and stabiliser in the right order.