Quoted from Nate:Hi Pam,
I've sent a couple of emails to you at Pinbits, but haven't heard back. Do you expect to have the TZ trough eddy sensor boards back in stock? My TZ no longer detects that Power Ball at the trough, and your design set looks superior to the original WMS board set.
Thanks, Nate
http://ksarcade.net/proximity-board-set-for-twilight-zone.html