phenomenon that occurs in many materials particularly in the metals from which a typical tube is formed the material retains some shape memory and attempts to return to its original pre bent position by u201c springing back u201d toward the original prebent position by up to several degrees by offsetting the locations of the angle indicating indicia i a and the multiplier indicating indicia i m on the sidewalls 124 126 and using calculations and tables known to those skilled in the art the typical springback is taken into account without the need for the user to overcompensate the bend the stop 150 is generally u shaped and includes a first elongated arm 160 having a first pivoting end 162 and a first free end 164 the first elongated arm 160 is disposed along one side of the bender head 120 a second elongated arm 170 extends generally parallel to the first elongated arm 160 and includes a second pivoting end 172 and a second free end 174 the second elongated arm 170 is disposed along an opposing side of the bender head 120 the first and second pivoting ends 162 172 each include a preferably rounded opening 166 176 respectively extending therethrough so that a pivoting member 178 such as a bolt or a screw may be inserted through each of the openings 166 176 to pivotally retain the first and second pivoting ends 162 172 against the base of the bender.