180 u00b0 apart this means that inner side plates 26 and 28 will only assemble on blade 22 in one configuration i e with the narrowest part of the inner side plate on the side of the blade having the side cutting edges projecting for cutting in addition to assure the proper markings 42 correct direction of rotation the fasteners 30 and matching holes 40 can be placed at different radial distances from the axis of rotation of the assembly thus the inner side plate for each side would have to match the blade in three places the large central bore 36 the fastener 30 would have to match the corresponding hole in the blade and the hole 40 would have to align with the other hole in the blade 22 to receive the fastener from the other inner side plate thus the inner side plates and the blade can only be assembled in one way this inner sub assembly after being snapped together is mounted upon a pair of outer side plates 44 best seen in fig9 and 10 these plates are identical to each other so only one will be described here the outer side plates are also wedge shaped in a cross sectional view of the inner and outer surfaces the outer face 46 is perpendicular to center bore 48 and bore 48 is designed to fit a saw arbor the inner surface 50 is formed at the same acute angle to outer face 46 as formed by inner face 32 and outer face 38 of the inner side plates to properly position the pair of outer side plates the inwardly directed hubs 52 on which the inner side plates ride are made with recessed protions 54 this recessed portion 54 upon assembly then abuts the.