I'm working on a Super 64 that is about 25 years old and I have it tuned, reeds set, new windsavers where needed. The problem is the top plate plays perfect and the bottom plate is very airy? I've taken it apart three times and looked closely to make sure I'm not doing anything wrong, but? The mouthpiece is on correctly it isn't that. I think the comb is messed up on the bottom of the harp and may have always been that way. Has anyone ever had this happen to them? More importantly where is the place to buy a new comb for it?