Check out Page 18 v Page 22 both relate to changing the guard ring.
Page 18 is wrong I'm sure.

Instructions for:
Guard ring when using mowing appliances and
Guard ring for sawing appliances

The Always fit Guard ring (1)

a) Guard ring is pre fitted to FS460
b) Guard ring should only be removed by dealer. (from another page)
c) Guard ring in not (1) that is the guard washer. See next page as item (2)
d) Gaurd ring is (3) in the top image and (4) in the bottom one.

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