I can't remember where I got this idea, but I love it! At someplace
like Sam's Club, buy a large, clear square plastic container of
pretzels (or the like). Mine was about 12 inches high and just under
8 inches wide, on each side. Eat pretzels. Soaked label off of
container (this was the hard part!). Cut a hole in the bottom, about
the same size as the hole in the top. Then insert your work in one
end and the flex-shaft in the other. Assuming the plastic is clear,
the work is visible and there's no dust, grit, etc., in your face.
Thanks to the person who originally came up with this idea!