I suggest the book Early Motorcycles Construction Operation and Repair. It's able to show through text and pictures how a great variety of forks have been constructed. Theres even a seat configuration where the seat post has a spring system that further dampens the road bumps. It's printed by Dover publications. I read about this book on here and have enjoyed it ever since I got it. Hey the Reading Standard has built in hidden springs for it's front fork and the way it's made is all covered in the book. Of course the know how and the means to do so are optional if one chooses to do a fork project. It's interesting how a fender covers the front leaf spring and it's left half exposed.
LATER.
LATER.