Panasonic ES-RT53 Service Manual page 7

4.2.5. Side panel
Set the side panel on the body and insert the projection on back
of side panel into the housing first. Then hook the front side
and the rear side of the side panel in order.
NOTE:
Make sure that the left and right side panels are firmly fitted
on both rear and front side.
4.2.6. Trimmer
1. Align the housing with the hooks of trimmer.
2. Confirm its operation or smooth movement of trimmer.
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ES-RT33/ES-RT53