wow, too bad you didnt remove that cpu. 6/7th gen cpu despite it being a celeron -> an i3 of sorts. probably worth more than just scrap on a single unit. oh well.
I've got another idea for you. Mount a 1/4" steel plate, with a lip on the back edge, right below your hands in the sandblasting cabinet. That way you can just set the PCB on the plate and use both hands with the hammer.
