Just acquired a decent American LS440 splitter this week and out of the box will split leather, even before cleaning the blade up. My question is about the leather thickness adjustment at the top of the machine. I can’t get it to go past the 9 on the scale and if I go larger, it will go past the 15 marker. How do you adjust this? When set at 9, the split leather comes out at roughly 4 oz thickness.  Additionally how to you level the rollers on it? they are fairly level now but the thinner y