I never heard of them before, either. Apparently they're no longer offered by Kennon. I've found past advertisements from a decade or more ago, but nothing recent.
Seems like a neat feature.
-Kirk Wennerstrom President, Cessna 150-152 Fly-In Foundation 1976 Cessna Cardinal RG N7556V Hangar D1, Bridgeport, CT KBDR
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