Reusable Electrical Connector between Electronics Package and Flexible Sensor Substrate

Elastomeric connectors are normally used for this. Your flex would have two or more registration holes that engage [mechanical, passive] pins on the connector. Then you clamp down a locking bar on top of the flex circuit, pressing it onto the elastomer. The other end of the elastomer presses on the PCB tracks.

Your use of Usenet http://66.102.9.104/search?q=cache:VEjFh2CPNC4J:en.wikipedia.org/wiki/Usenet+follow-Usenet-customs-and-*-rules+*-a-service-for-*-*-*-*+hide-the-fact-*-*-*-they-are-*-on-Usenet+concerns-*-*-*-*-about-the-Google-interface+zzz+*-*-*-*-*-*-*-*-*-*-*-*-*-is-now-legendary+qq-qq+Google-cannot-muster-*-*-*-*-*-*-*-*-*-*-*-*-* needs improvement. If you feel *compelled* to ask the same question in MULTIPLE newsgroups, *this* is the prefered technique: http://66.102.9.104/search?q=cache:qHhBKJ-sXKYJ:en.wikipedia.org/wiki/Cross-post+adequately.answered+corrected+with.commas+individually+Disclaimers+deductible+Newsgroups-line

Your technique

is selfish and inefficient

The last half of this thread explains WHY and fleshes out the (more acceptable) cross-posting paradigm:

*-*-*-*-*-*-*-*-appear+*-proper-answer-*-*-*-given+much-easier-*-*-*-*-*-*-*+*-frowned-on+*-correcting+*-Followup-To-*+*-*-_perfect_-*-*-*-*+*-*-*-too-lazy-*-*-*-*-*-appropriate-*+*-polite-*-mention-*-*-*-*-*-*-*+Just-because-*-*-*-*-*-*-*-*-does-not-mean-*-*-*-*-*-*+mark-*-*-*-*-all-*-groups+*-*-*-*-two-groups-*-*-aren't-*-different

The last post in that thread hints at why (clueless) Google Groupers are so reviled by those who read Usenet using a "newsreader".