I asked a similar question not too long ago, though my situation was different:

What about backing off the nose screw on this saddle?

Lazy, procrastinating SOB that I am, I've so far only backed of the tension bolt a bit. The saddle sits. [MENTION=424205]Salamandrine[/MENTION] described (with photos) how he used Durham's Water Putty to reshape a Brooks Pro. I am planning to go one better, as I have a nicely shaped Ideal 90 Rebour. I was going to make both inside and outside casts, then use [MENTION=73614]rhm[/MENTION]'s method of fully wetting the saddle.