Chain Goes Slack When Coasting/Backpedaling - How To Fix

I show how to fix a sticky freehub which can cause the chain to go slack when coasting (freewheeling), or when you backpedal. The old grease get thick, and also dirt can get inside. This can usually be fixed by flushing out the old grease/dirt, and relubing the freehub with an oil like Phil Tenacious Oil.
The bike is a 2000 Trek 6000. The hub is a Shimano FH-C201.

Freewheel vs Cassette:
Freewheel vs Cassette - What Are They...

How To Fix A Sticky Freewheel:
How To Fix A Sticky Freewheel

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