I stopped by the hobby shop tonight and picked up some small 4-40 threaded rod and some threaded clevis ends to connect the flap arm to the Ray Allen position sensor that will feed the flap position to the VP-X. I stole the dimensions from Mike Bullock’s site and they worked perfectly.
I fabricated a small clip that bolts to the adel clamp to connect the clevis to the flap rod. I used a piece of 0.063″ angle with one leg mostly cut off. This wraps around the side of the adel clamp flange and will prevent it from rotating.
Here’s the other end. I didn’t tighten the nut fully since it interferes with the nut on the clevis.
I turned the screw around on the clevis and tightened it more fully. I ended up also having to use one of these tiny lock nuts to provide clearance from the clevis screw.