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Yup- what he said.

LEXOL, leather conditioner, Ive also used Glove oil with no ill effects,Im just throwing these out there two soften the leather so as to help take the crease out- you could try it without anything...

I wouls say to put a little neatsfoot oil on it ,than put it between two flat planks or books,and add some weights and leave it for a day or two-Thats what I would try,but Im no expert