Patent ID: 7731146

Claim:
A method, comprising: providing an outer extrusion rail having swivel nut holes proximate one end and at least two sets of dowel pin holes spaced longitudinally along the outer extrusion rail; providing an inner extrusion rail having swivel nut holes proximate one end and at least two sets of ramps spaced longitudinally along the inner extrusion rail, wherein said sets of ramps are spaced substantially the same distance apart as said sets of dowel pin holes; disposing a bushing in each of said ramps; attaching said bushings to said outer extrusion rail by placing a dowel pin through each of said bushings and through each of said sets of dowel pin holes; disposing a through swivel nut in said swivel nut holes on said outer extrusion rail; disposing a threaded swivel nut in said swivel nut holes on said inner extrusion rail; placing a threaded actuating screw through said through swivel nut; engaging said threaded actuating screw with said threaded swivel nut, wherein adjusting the threaded actuating screw changes the position of said inner extrusion rail with respect to said outer extrusion rail.