This is the arm of the Dryosaurus skeleton I put up earlier in the week. You can see here quite clearly that the bones are held in ‘cradles’ that then are bolted onto the main support for the skeleton. This technique for mounting specimens has become popular recently (the remodeled dinosaur gallery in the Humboldt in Berlin uses the same methods) and it’s a welcome change from the old style. The bones used to be bolted directly to the frame meaning that they were often drilled through or had rods and bolts put through the bones themselves.
Obviously this is infinitely preferable to any form of damage or manipulation of the bones. It allows them to be put out on public exhibition, but it *also* allows them to be removed as single units as the cradles can be simply taken off the frame, and the whole thing doesn’t have to be taken apart to get to a single element. As a compromise, it’s relaly pretty good.