just a note- it seems that my W124 a 93 300E 2.8 has a metal cover on the monowiper and will not simply pop-off.

i sprayed some white lithium grease on the shaft and ran the wiper a few times to try and let it penetrate.

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93 300E 2.8 - The Beezy
05 Mazda3 Hatch - The Zoom

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