Neopost IS-440 User Manual page 202

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3
Raise the brush and lift the complete brush holder assembly.
4
Lift the metal retainer to remove the sponge.
Remember its direction.
5
Clean the sponge and the brush.
6
Re-install the sponge and retainer in the same direction.
7
Put the brush back and push the release lever back down
until it snaps into place.
8
Push down on the upper drive assembly until it locks back
into position.