I wondered if those fans were held on by clips, but didn't have a 707 to
look at for sure. If you don't want to take the radio apart, hold the fan
in place and a bit of cilicon seal would holt it in place. Just don't use
too much and get any on the fan blade. But, a little dab top and bottom
or on each side wshold do the trick.
73s
Butch Bussen
wa0vjr