Not my finest repair, but from the posts above and some time looking at photos online, it was confirmed I was missing the isolator pad and negative contact. I decided to give it a try. For my insulator I used a clear disc of plastic that was part of my watch battery blister pack, cut into the neatest circle I could manage. The contact was a few strands of copper wire coated with solder, one end turned up slightly. Up turned end placed against the contact pad and a two second touch with the solde