pivot plate 407 pivot plates 407 408 409 and 410 rotate about fasteners 411 412 413 and 414 urging central mast 101 and adjustable angle adapter tube 420 to maintain a generally parallel orientation depression of the button 417 allows flow of compressed air from supply hose 419 to pneumatic cylinder 401 when the power assist valve system 405 is in equilibrium valve 416 is not actuated and button 417 rests against contact tube 418 downward applied force on channelizer drum 200 is eventually transmitted to compression spring 415 if the applied forces become great enough compression spring 415 deflects and button 417 is depressed enabling flow of compressed air from supply hose 419 to pneumatic cylinder 401 urging it to extend the extension of pneumatic cylinder 401 urges cam arm assemblies outward against the interior of drum 200 aiding in the reforming process fig1 is a pneumatic diagram of a second exemplary embodiment where a pneumatic power source 419 is available depression of button 417 allows compressed air to flow through hose 423 to cylinder 401 urging cylinder 401 to extend and urging air from the annular side of cylinder 401 through muffler 426 to atmosphere release of button 417 allows air flow through mufflers 425 and 426 as elastic cords 109 and 120 urge cylinder into a retracted position fig1 is a pneumatic diagram of a second exemplary embodiment where power source 419 is unavailable or has.