Get a miter box like the one in your picture. Using a knife set the black cam clamp in the holes to make a slice of the required thickness.
Slice. Remove slice, slide the stuff up until it hits the clamp. Repeat.
Get a miter box like the one in your picture. Using a knife set the black cam clamp in the holes to make a slice of the required thickness.
Slice. Remove slice, slide the stuff up until it hits the clamp. Repeat.