Cuisinart CSB-85C Instruction And Recipe Booklet page 8

holding ribs (grips) and turn it very slightly clockwise. This locks
it in place on the plastic blade sheath and prevents it from sliding
up during processing.
E
G
Note these important features of the blade ring. The blade ring can
be placed over the plastic blade sheath in two different ways:
If you hold it this way (A), you will see the word "Sharp" on the blade.
Assemble the blade this side up to use the sharp edge.
If you hold it this way (B), you will see no writing on the blade.
Assemble the blade this side up to use the blunt edge. (See the
section on processing food, page 13, for information about when
to use the blunt edge.)
A.
C
F
D
SHARP SIDE
B.
8
BLUNT SIDE UP