Abstract: Provided is a bow assembly comprising a main beam elongated in a first direction to define a distal end, and a proximal end, wherein the distal end has a distal end facing surface from which extend, an upper member, and a lower member having a first set of threads thereon; and a riser having a proximate facing surface, an upper groove dimensioned to engage the upper member, and a lower opening through hole dimensioned to engage the lower member; a threaded fastener adapted to threadedly engaged the first set of threads; and wherein the riser is assembled with the main beam and the threaded fastener such that the upper member is inserted within the upper groove, the lower member is inserted within the lower opening, the distal end facing surface faces the proximate facing surface, and the threaded fastener is threadedly engaged with the first set of threads.