tim wrote an answer about Black Diamond Factor 130 Alpine Touring Boot - Men's on January 18, 2012
this will happen, especially with the older models (anytihng older than this year's newly designed "Factor 130"). i would suggest going to a hardware store and getting a screw and nut that fits as a backup pin. i've blown both my ski/walk modes numerous times and a hardware store screw and nut does the job just fine. your other option is to call BD and work on a refund or replacement - but, it will happen again. i totally agree. these are the best bits ive ever skied, but the blown out ski/walk mode is a deal-breaker.