I'm an experienced mead maker with a couple of Micro-Matic Sanke D kegs I bought online over the pandemic. I finally got around to using one, and I'm stuck on the last part of the teardown: removing the CO2 valve from the down tube. I've watched a few YouTube videos and they don't really go into huge detail on this part. I even broke down and called Micro-Matic who basically said that this stuff wasn't designed to be regularly disassembled but instead pressure-cleaned with an expensive keg washer. I'm hoping someone out there has a clever tool or approach they use to handle this situation, even if it's something silly like "I hold it down over this widget with a bump which pushes up the ball and then I spray cleaner down the tube and follow it up with rinse water and I'm not dead yet".

Help?