This is probably a little extreme, but it worked for me
I took a flattened grey mould covered Wrights saddle with an "ass hatchet" ridge from a long forgotten 1969 Raleigh Grand Prix altered wheelbase wreck I was given and made it useable.
It was hard and looked like it would break like a potato chip if any straightening was tried.
First I washed it in the Kitchen sink with liquid dish detergent and hot water. This removed the mould and softened the leather somewhat While it was still soaking wet I slopped on "Jamieson Body Moisterizer, Enriched with Collagen, Elastin and Botanical Extracts", on top and bottom. (I would think similar products are available in most drug, health, beauty type stores) The label claimed it "smooths, firms and hydrates", sounded perfect. I then stuffed the mess with news paper jammed between the top and the frame to form an "as new" profile, as the top was pushed up the sides automatically pulled in. I then forgot about it for a few days. By the time I remembered it, it had hardened into the desired shape and turned brown, there was considerable slack in the adjuster and so I tightened it enough to remove the slack and the gave it a good dose of Proofide top and bottom.
I installed it on my urban fixie beater and have ridden on it for several hundred km over the summer and fall and it is still comfortable. There is some minor surface cracking and there is some sinking along the center line adjacent to the three vent holes. It seems less firm and the surface also seems less resistant showing lighter colored scratch marks when compared to a newer antique brown Brooks Pro, but perhaps this is an apples and oranges comparison.
It looks like a very well used 35 year old leather saddle, not desirable enough for thieves when I park downtown, but nice and comfortable for the ride home.
Marcus Coles
London, ON, Canada