How to fix extension ladder rung lock? The black 'flipper' is stuck in the closed position somehow and now doesn't allow the ladder to extend (pic 1). Should look like the second

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Werner, 29-1, Lock Flipper Kit: Ladder Accessories

✔【Premium Aluminum Alloy】：RIKADE telescopic ladder using 6063 high strength and high hardness aluminum alloy tube, better quality and safer. Package

Telescopic Ladder, 8.5FT RIKADE Aluminum Telescoping Ladder with Non-Slip Feet and Stable Hook, Portable Extension Ladder for Household and Outdoor

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How to install Werner Aluminum Extension Ladder Locks