(makeshift board heater)
Then there were three. Now need a jig to be able to apply the paste to the bottom side - perhaps a piece of plywood with a cutout?
As you can see, the middle pin of the transistors and the tabs wouldn't flow. These are multilayer boards with that large copper area exposed. I also had to "reheat" the boards during the process. I am not confident I really got good contact on the j-hook trimmers. I will just apply hand solder to these parts likely.