There's been a discussion the last few days about how to hold the models when painting on my favorite Yahoo Group, STMFC,(steam era freight cars). I thought I'd take this opportunity to show how I've dealt with the issue.
I built this tool.
The two legs are made from bent brass to form the 2 angles and a length of brass tube for the leg. Those are simply soldered together. The two angled bits are drilled for machine screws.
As you can see a simply secure the tool to the model using the truck mounting screws in the bolsters. I can now spray all surfaces without having to touch the model.
And a small screw-eye is inserted in the end of the handle so I can hang the whole assembly up while the paint dries.
I actually have a number of these. Best homemade tool I ever made.