Probaby just stuck. They're pretty hard to move to adjust, but you just have to keet trying. They're set that way because of the vibration they have to endure. Try gripping the black outer shell with your fingers, and just use your thumbs to try to move it. You may have to press hard. CAVEAT: Be careful, don't hurt yourself.
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2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)
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