I was pretty sure that I needed some grounding tabs on the firewall so I ordered some solder tabs from TE. I was still not able to rejoin the general prison population because of Covid, so instead of buying some plate I TIG welded two of the copper flat bars together to make a 1in wide plate. I cleaned that up and then soldered the two groups of six tabs to the plate. A few holes later and voila…grounding tabs!