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This is an upgraded version of the classic square piston originally included in most QT series and Lumenite II series flashlights POST 2024. All that’s needed for installation is removing the bezel from the battery tube and smack the end with the brass square on a non-marring surface (or your palm). Set it aside, grab this kit, and take out the new piston (brass square). The smart material (black dot) will stick to the important end, which needs to be oriented in the way shown below – closest to the outside edge of the engine.