Hi Joe,
The FW top tension is slightly different from the 66 and 99. I downloaded the files you directed me to -- really helpful, so thanks for sending me to the site!! I'll definitely be checking out some other information there.
I took apart my top tension and tried to pay close attention to how it all fit together. I *think* I got it back together correctly. I also looked at some photos online of early Featherweights and zoomed in on the tension, and mine looks the same.
Thanks!
If anyone has the exploded diagram for a very early Featherweight, though, please do pass it along!
Ila