Sorry to bump this old thread, but by reading the SHOT 2007 report, I noticed the part where Doug talks about the ADAPT mounting system that's available for use with all existing Petzl Tikka and Zipka headlamps.

Sorry if this is old news to some of you, but I just yesterday discovered this item... wished I had last summer ! *shrug*

Petzl ADAPT system
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"The only easy day was yesterday."