Ducati MONSTER 821 Workshop Manual page 591

Working on the swinging arm LH internal side, slide out the LH spacer (16).
Working on the swinging arm RH internal side, slide out the RH spacer (17).
Check the bearing movement; make sure it emits no noise and that it has no interferences.
If necessary, work on the swinging arm RH side with the suitable puller and remove bearings (18) and
spacer (19) as indicated.
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