Trying to FIX a Faulty 34+ year old Calculator

Hi, this video shows me attempting to repair a Radio Shack Portable Desktop Calculator which was released between 1978-1985.
Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things.
I do love fault finding and trying to fix broken things so I hope that comes across in this 'Trying to FIX' series.
Many thanks, Vince.