Introduction
Parts
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Remove the latch by using a flathead screwdriver to carefully bend the plastic retainers to the side while gently lifting the latch out.
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Remove the remains of the old wave washer and remove all corrosion residues before inserting the new M34 x 41 x 0.5mm wave washer.
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Then snap the latch back into place and screw the unit back on.
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One comment
I bought the wave washer via ebay (10 pieces) and replaced it as described here. Only residues from the old one were remaining...
Now the closing mechanism of the blade feels firm again and (so far) no leakage was observed.
Thanks!