Hey All, I just wanted to do a shout out to Joe Carpenter for his F-Hole plugs.  If you have a big arch top and fight feedback this may be a good solution for you.  I play with a big band (18 piece) and compete with a horn section and a loud bassist. These make all the difference in the world when I'm playing.  I have them in my heritage Eagle, Gib L-4 and Gib 330.  They work great.  Joe is out of Phoenix Az and can be found on Reverb.