This is a mundane question, but it's an important safety issue, and I expect that not everyone would have the same answer. I'm surprised it doesn't seem to be in the FAQ.
When you open a chassis like the CTC177, where the back and bottom are molded as one piece, how do you physically support the tube and board while you're working so it doesn't tilt backward?
For any TV chassis I've ever opened that was made in the last 25 years, they have boards mounted on the back with short wires connecting to the main board. When you remove the back, what's your strategy for dealing with the dangling boards?