Here are two “Can’t Twist” clamps holding a cylinder to a faced block of aluminum secured in the vice. The reason for this setup is to prevent the cylinder from being deformed by the clamping force of the vice. There will be two aligning pins pressed into the top end of the cylinder and if it gets deformed while drilling and reaming, then as soon as the pressure is relieved, the holes would no longer be positioned correctly. Downward pressure won’t deform the cylinder in this case.
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