Hi,
The Feda comes with this GWS PG-03 and it shouldn't yaw after take off if it is set up correctly.
Please go here
http://www.gws.com.tw/english/service/service.htm. On this page you find page 1 and 2 of the Gyro manual.
This should help you.
Furthermore, in case you need this, we sell the Feda crash guard and a crash kit. We have a special offer for the crash kit (free worldwide shipping). Check here:
Amersfoort Airport.
Good luck!
Kind regards,
Jan-Dirk Schuitemaker
The Netherlands