If you have to photograph something at a significant angle to the vertical, shooting through the restraint won't work anymore due to distortion.
Covering only part of the spider solves this issue, but requires some care and delicacy. To do it, completely cover the spider as usual and roll it into position. Try to keep it as close to the edge as possible. Then lift the restraint a little higher than you would for a roll and shift it so that the desired part is exposed. Timing when you put the restraint back down is critical because as soon as the spider realizes it's at the the edge, it'll try to wriggle out.
Now you can shoot at any angle you want without fear of distortion. In the above image, things are setup for a posterior epigynum view. See the next image for an idea of how this might work in practise.
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