To stiffen the tail feathers on a Playmate- Take a needle and thread and run a thread aaround the tail feathers.. Poke a hole about a quarter inch in from the ends of the stab and rudder then glue the ends to the bottom of the fuse . same thing with the wing, only you need to have two threads on each wing.To do this you need two holes in each wing about 2/3s out then threadglued to the bottom of the fuse . This aint well said but hope you get the idea, this helps the tail feathers a lot ... Dont know if its needed on the wings.....
Sorry I aint smarter..........