I've been searching but I can't find it, a while back I saw a link to an article on how to rebuild the heater valves on a w108 4.5 car. If someone could point me in the right direction that would be great. Thanks in advance.

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81 300SD
87 300E
72 280SEL 4.5
03 Bajaj Chetak
64 Vespa GS 160 (slow restoration)