I forgot an important step. I used a combination of neets foot oil and mink oil, in heavy coats, to soak the saddle after the glycerine treatment. I kept it in a warm place and repeated this treatment for many days as the oil and paste would go right into the old leather. The cracks are still there but the saddles now have about the same flexibility as a new one. This whole process takes about a month. I keep a large close pin type clamp on the part of the saddles that goes between your legs, when I'm not riding, so that they don't start to flatten out. Some old saddles tend to have a memory of their old wowed out self.