had this system on video about 10 years ago ,i tried it but only got to last flight.i have
never heard of flights being pulled , but u do have to pull every 2nd tail feather then when they are up u pull the other ones that are left, if u dont then they
will keep their tails untill the are yearlings,beleive me it takes a lot of time an effort to do
it proper,i don,t have the video now or u could have had it ,it was made by samson bro
in usa if this helps.