An expandable device, comprising: a first and a second superior arm (109a, 109b) and a first and a second inferior arm (110a, 110b), each arm (109a, 109b, 110a, 110b) having an anterior and a posterior end and a top and a bottom surface, and each arm (109a, 109b, 110a, 110b); the expandable device being characterized in that each arm (109a, 109b, 110a, 110b); has an anterior and posterior opening through the top and bottom surface, wherein the first superior arm is positioned over the first inferior arm with anterior and posterior openings in alignment, and the second superior arm is positioned over the second inferior arm with anterior and posterior openings in alignment; and the expandable device being further characterized in that it comprises: four cylindrical bolts (112a-112d) positioned within each of the openings of the arms (109a, 109b, 110a, 110b), each bolt (112a-112d) having a top end, a bottom end, an outer surface, and a first, a second, a third, and a fourth slot within the outer surface; wherein the first and second slot of each bolt (112a-112bd) are positioned opposite from each other and each extend from near the middle of each bolt (112a-112d) towards the top end of each bolt (112a-112bd), and the third and fourth slots of each bolt (112a-112d) are positioned opposite from each other and extend from near the middle of each bolt (112a-112d) towards the bottom end of each bolt (112a-112d); a first rod connecting each of the bolts (112a-112d) positioned within the anterior openings of the arms (109a, 109b, 110a, 110b), and a second rod connecting each of the bolts (112a-112d) positioned within the posterior openings of the arms (109a, 109b, 110a, 110b); and a plurality of pins, each pin connected to an inner surface of each of the openings of the arms (109a, 109b, 110a, 110b) and slidably engaged to a slot of the bolt (112a-112d) positioned within the respective opening. a first and a second superior arm (109a, 109b) and a first and a second inferior arm (110a, 110b), each arm (109a, 109b, 110a, 110b) having an anterior and a posterior end and a top and a bottom surface, and each arm (109a, 109b, 110a, 110b); the expandable device being characterized in that each arm (109a, 109b, 110a, 110b); has an anterior and posterior opening through the top and bottom surface, wherein the first superior arm is positioned over the first inferior arm with anterior and posterior openings in alignment, and the second superior arm is positioned over the second inferior arm with anterior and posterior openings in alignment; and the expandable device being further characterized in that it comprises: four cylindrical bolts (112a-112d) positioned within each of the openings of the arms (109a, 109b, 110a, 110b), each bolt (112a-112d) having a top end, a bottom end, an outer surface, and a first, a second, a third, and a fourth slot within the outer surface; wherein the first and second slot of each bolt (112a-112bd) are positioned opposite from each other and each extend from near the middle of each bolt (112a-112d) towards the top end of each bolt (112a-112bd), and the third and fourth slots of each bolt (112a-112d) are positioned opposite from each other and extend from near the middle of each bolt (112a-112d) towards the bottom end of each bolt (112a-112d); a first rod connecting each of the bolts (112a-112d) positioned within the anterior openings of the arms (109a, 109b, 110a, 110b), and a second rod connecting each of the bolts (112a-112d) positioned within the posterior openings of the arms (109a, 109b, 110a, 110b); and a plurality of pins, each pin connected to an inner surface of each of the openings of the arms (109a, 109b, 110a, 110b) and slidably engaged to a slot of the bolt (112a-112d) positioned within the respective opening. four cylindrical bolts (112a-112d) positioned within each of the openings of the arms (109a, 109b, 110a, 110b), each bolt (112a-112d) having a top end, a bottom end, an outer surface, and a first, a second, a third, and a fourth slot within the outer surface; wherein the first and second slot of each bolt (112a-112bd) are positioned opposite from each other and each extend from near the middle of each bolt (112a-112d) towards the top end of each bolt (112a-112bd), and the third and fourth slots of each bolt (112a-112d) are positioned opposite from each other and extend from near the middle of each bolt (112a-112d) towards the bottom end of each bolt (112a-112d); a first rod connecting each of the bolts (112a-112d) positioned within the anterior openings of the arms (109a, 109b, 110a, 110b), and a second rod connecting each of the bolts (112a-112d) positioned within the posterior openings of the arms (109a, 109b, 110a, 110b); and a plurality of pins, each pin connected to an inner surface of each of the openings of the arms (109a, 109b, 110a, 110b) and slidably engaged to a slot of the bolt (112a-112d) positioned within the respective opening.