I got a $5 Zeiss Ikon Contessa (non folding) the other day, the camera is cosmetically good but needs a CLA.
It came with the original leather case, which is in decent shape, however the leather in the bottom (where it hinges) is starting to crack.
Is there any preventive measure I could take to recondition that leahter and make it flexible again so it won't tear apart?
I also use neatsfoot oil. I usually buy it from a shoe repair shop. Sporting goods shops may have it (used to be popular for baseball gloves) and hardware stores.
I'll tell you what I do to my 1961 Brooks Swallow bicycle saddle
I find a cut of meat with lots of fat
Take that fat and wipe it all over the leather
I even cook it first
I think it works.
All you need is tallow and I figure the fat is good enough.
I wouldn't use anything with silicone in it because then you'll clog the leather and it won't readily accept any further softening
Soften deeply and infrequently. Like watering your grass/trees/shrubs
Too much softening and it's all over.
Shoe polish spit shine -no silicone- will shine it up and dye it back to original color if you want that. It will also rub off some.