Reinforcing Steadiness: Tips to Prevent Your Dog from Chasing Birds (Fixing Behavior Problems‪)‬

(Problem) I have a seven-year-old Llewellin setter and he has turned out to be a great dog, both hunting and as a companion. When I first got him at seven weeks I fooled around with the "wing on a string" technique. I did it only a few rimes and then stopped. I was told not to do it at all with a puppy because I would be teaching him to point by sight rather than by using his nose. After reading several articles regarding introducing pups to birds I noticed some "experts" say that you should use the "wing on a string" technique and that it will not change the outcome of your dog's pointing ability. My question is, should I or should I not use this technique? I am confused on what to believe. I ask this because there will be another setter in my life soon and I don't want to be paranoid about introducing him to birds.