Extension itself was quite long enough on our Solera. The piece inside the extension which activates the tire valve when adding air or checking pressure was too short so it never opened the tire valve, thus prohibiting checking the pressure or adding air. Corrected by cutting several threads off the extension, exposing more of the inner "actuator".
Again, suggest you check the other threads on this issue - see link in my post above.
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JLeising
2012 Solera "S"
Calif SF Bay Area
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