the hair dryer will work, but it may loosen up after a few months. I did a set that had a few buzzes
fixed them for the most part.
the other thing to try is apply a strip of felt on the back side of the ribbon, from top to bottom.
tape or contact cement will work.
also a note, on the latter ribbons on the inside, in the centers there was a small pc of foam that was
glued to the magnet, front and back.
on a ribbon that had a real buzzy/slappy area I did this and stopped the noises.
I can find the post I did on this if you need to go this route, just let us know......