Search:

To add to what Euclid440 has said you should be able to use some basic math to work out how wide the spine needs to be to set an angle.

If you know trigonometry this will help.

If you don't...

I'd almost be tempted to cheat with that spine and use a spine clip.

http://i01.i.aliimg.com/img/pb/910/179/295/295179910_592.JPG


I have no idea if it would work.... I might go pick one up...

The spine looks to have a little wear as well and the shoulder is level with the spine on the pic you posted. Perhaps 2-3 layers of tape and trying to keep off the shoulder will help.

The bevel...