That W&W looks like such an interesting machine, especially next to the FW. The lines are so similar. The FW always seemed so much more "squarish" than other Singers. Interesting!
I ran across something yesterday (not sure if it's been posted--haven't been on the board as much lately) that has certainly helped me, since I am now the proud owner of a frozen black 301 long bed! A 301 adjusters manual is online at Scribd. You can view it for free, but can't download unless you are a member (subscription fee) or are able to upload something in return.
Singer 301 adjusters manual.