Kids, do not try this at home!
The .049 backbone tube is ovalized vertically and has some Osell-trademark
lightening holes in the bottom that artfully increase in size from the ends to the middle.
Hopefully the tube is heavy enough to begin with to handle this treatment. The Rockler
caliper was pressed into service to see if the holes distorted when Terry sat on it, but
if so the distortion was right at the minimum resolution of the caliper and hard to