Abstract: A pin array includes a plurality of pins arranged in an array; and one or more flexible tubes in contact with each of the pins such that, when pressurized, each of the flexible tubes applies pressure to sides of the pins to prevent further movement of the pins. A method of locking a pin array that includes a plurality of pins arranged in an array; and one or more flexible vessels in contact with each of the pins, the method comprising controlling a pressure of a fluid in the flexible vessels to selectively allow or prevent movement of the pins with respect to the flexible vessels.