hsr-benelli S-series Service Manual page 65

Position the piston (3), as shown in the figure, with the arrow on
the piston pointing towards the exhaust.
Insert the pin (4).
ATTENTION:
Always use new elastic rings for mounting the pistons.
To avoid breaks that can take place with the rings bent.
Position the two elastic rings (5), one for each side pay attention
not to deform them.
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