10-04-2013, 03:21 AM
10-04-2013, 04:09 AM
I'm not sure what's wrong with the keys on your HP-67, but it's quite easy to open up the calculator, remove/replace individual keys then reassemble with no harm done. Here's how you open the case and get to the keyboard.
Edited: 4 Oct 2013, 4:10 a.m.