Abstract: A rotatable joint, comprising: at least three bar connectors; an axis piece comprising a central pivot and at least one of the at least three bar connectors longitudinally aligned with the central pivot; and two rotatable joint pieces each comprising a bushing and at least one of the at least three bar connectors oriented along the diameter of the bushing and aligned along the axis of symmetry of the bushing, wherein the bushing of each of the two rotatable joints pieces is configured to slide over the central pivot thereby coupling the two bushings with the central pivot and allowing the rotatable joint pieces to rotate about the central pivot, and orient the bar connectors of the rotatable joint pieces perpendicular to the bar connector of the axis piece.

Abstract: A spring for connecting a pipe to a rod, the spring including a flat tab attached to a rod and aligned with a first face of the rod and a second unattached tab aligned with a second face of the rod that is opposite to the first face, and a diagonal bridge connecting the first flat tab and the second unattached tab, wherein the angle between the attached tab and the diagonal bridge is greater than 90° and a button located on the flat tab, wherein the button protrudes from a distal end of the rod when the spring is normally open, and wherein the button is configured to engage with a corresponding hole in a pipe.

Abstract: A rotatable joint, comprising: at least three bar connectors; an axis piece comprising a central pivot and at least one of the at least three bar connectors longitudinally aligned with the central pivot; and two rotatable joint pieces each comprising a bushing and at least one of the at least three bar connectors oriented along the diameter of the bushing and aligned along the axis of symmetry of the bushing, wherein the bushing of each of the two rotatable joints pieces is configured to slide over the central pivot thereby coupling the two bushings with the central pivot and allowing the rotatable joint pieces to rotate about the central pivot, and orient the bar connectors of the rotatable joint pieces perpendicular to the bar connector of the axis piece.

Abstract: A spring for connecting a pipe to a rod, the spring comprising: a flat tab attached to a rod, wherein the flat tab is aligned with a first face of the rod; an unattached tab aligned with a second face of the rod that is opposite to the first face; a substantially diagonal bridge connecting the flat tab and the unattached tab, wherein the angle between the attached tab and the diagonal bridge is greater than 90°; and a button located on the flat tab, wherein the button protrudes from the distal end of the rod when the spring is normally open, and wherein the button is configured to engage with a corresponding hole in a pipe.