No, but I hold field approvals for changing from cable to hydraulic, hydraulic to better hydraulic, really grabby auto-type brakes to Cessna 310 wheels and brakes, and three master cylinder swaps. All done locally. I kinda prefer heel brakes, so would never even think of converting to toe brakes. My Decathlon is toe brake, and I occasionally think of converting it back. I have an awful time with the toe brakes in the "Tango" Cubs.