Broken battery contact HP-67

[Helix]

Yes, that’s not very difficult.
This page shows how to open the calculator:
https://www.hpmuseum.org/cgi-sys/cgiwrap...i?read=179
Only the first 5 steps are needed for this work.

Then, you will have to make a small a metal plate, glue it and solder the wire, like in this example of restoration:
https://www.hpmuseum.org/cgi-sys/cgiwrap...ead=237065
As the battery pack was dead, I took it apart and cut a metal sheet from this pack. It’s a bit flimsy, but it works.