That's the Stratus flybar carrier.From the MA Stratus manual...
Note the holes on the flybar pivot. There are
three. The hole closest to the inside will
result in very radical and less stable flight.
The hole on the outside will result in less
radical and more stable flight. The normal
position is the center hole and will provide
the best results.
Also: (this pertains to the CF end pieces..)
Note: Notice that the flybar control arms
have two holes on each side. The inside hole
is the normal position and will result in more
flybar throw. The outside hole will result in
reduced flybar throw and less control