About the paper size different in right and left, you can do like this step:
1, look at the picture a, loosen the 1,2,3.4
2. look at picture b, loosen the screw1, then tight the screw 2 a little, then tight the screw 1 in picture b
3. tight the screw 1234 in picture a
then check the size of the paper (if not correct, adjust it again)
if the right is bigger, tight the screw 2 in the picture b, if right is smaller, loosen the screw 2 in picture b
picture a
picture b
