The Power Hogtie machine is probably the most extreme and difficult bondage machine the House of Gord has ever produced, and in fact it was considered a step too far and later dismantled for spare parts.
The problem is lying face down with an arm sheath pulling the arms back tightly and then being placed under extreme pressure. Just lying in that position without the pressure is hard enough, but once the pressure comes on, breathing is nearly impossible. But these ladies come though the ordeal.