An apparatus comprising: an adjustably locking rotatable bracket having a) a first shank comprising a first connection end opposing a first apparatus end; b) a second shank comprising a second connection end opposing a second apparatus end, said first shank being rotatably joined to the second shank at a connection point joining said first connection end and said second connection end; c) a sprocket component joined to said second shank comprising a plurality of sprocket teeth; d) a trigger component rotatably joined to the first shank at a position sufficiently proximal to said connection point to engage said sprocket component, said trigger component comprising a trigger tooth structured to engage a sprocket tooth when rotated from an unengaged position to an engaged position, wherein said trigger component is effective when so engaged to prevent rotation of the connection between the first shank and the second shank in at least one direction, characterized in that the first shank comprises a first apparatus end having a hole structured to accommodate a screw or bolt, and the second shank comprises a second apparatus end defining an opening structured to accommodate a screw or bolt, and the sprocket component is non-rotatably joined to the second shank at said connection point. an adjustably locking rotatable bracket having a) a first shank comprising a first connection end opposing a first apparatus end; b) a second shank comprising a second connection end opposing a second apparatus end, said first shank being rotatably joined to the second shank at a connection point joining said first connection end and said second connection end; c) a sprocket component joined to said second shank comprising a plurality of sprocket teeth; d) a trigger component rotatably joined to the first shank at a position sufficiently proximal to said connection point to engage said sprocket component, said trigger component comprising a trigger tooth structured to engage a sprocket tooth when rotated from an unengaged position to an engaged position, wherein said trigger component is effective when so engaged to prevent rotation of the connection between the first shank and the second shank in at least one direction, a) a first shank comprising a first connection end opposing a first apparatus end; b) a second shank comprising a second connection end opposing a second apparatus end, said first shank being rotatably joined to the second shank at a connection point joining said first connection end and said second connection end; c) a sprocket component joined to said second shank comprising a plurality of sprocket teeth; d) a trigger component rotatably joined to the first shank at a position sufficiently proximal to said connection point to engage said sprocket component, said trigger component comprising a trigger tooth structured to engage a sprocket tooth when rotated from an unengaged position to an engaged position, wherein said trigger component is effective when so engaged to prevent rotation of the connection between the first shank and the second shank in at least one direction, characterized in that the first shank comprises a first apparatus end having a hole structured to accommodate a screw or bolt, and the second shank comprises a second apparatus end defining an opening structured to accommodate a screw or bolt, and the sprocket component is non-rotatably joined to the second shank at said connection point.