On Sat, 12 Jul 2008 11:47:46 +0700, Bruce in Bangkok

Apparently the diode adds power as the winch now pulls harder ;-)
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I might suggest that it's due to a cleaner set of contacts.
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Didn't you notice the smiley? { ;-) } with one eye winking?

Bruce-in-Bangkok

This is the well-known "clean car drives faster" effect.

Brian W