the apertures 144 can be configured as elongated curved slots 144 u2032 fig8 b which preferably do not extend completely through the annular body 140 and which can optionally include sloped entries as best shown in fig3 the second pulley 136 is attached to the shaft 102 via bearing assembly 196 the second pulley 136 is configured to be in pressing engagement with the bearing assembly 196 which is also configured to be in pressing engagement with the shaft 102 the bearing assembly 196 is positioned about the fourth diameter segment 112 of the shaft 102 the bearing assembly 196 is also retained on the shaft 102 via a snap ring 197 about a lateral end of the bearing assembly 196 and a flange extension or detent 199 of the second pulley 136 about an opposite end of the bearing assembly 196 a second endless belt 12 fig2 and 3 is wrapped around the circumference of the second pulley 136 and engaged with grooves 146 formed on the outer circumference of the second pulley 136 the endless belt 12 is wrapped around and engaged with a corresponding pulley 6 attached to the drive shaft 7 of the belt drive assembly 8 to transfer power from the drive shaft 7 to the shaft 102 referring to fig9 the shift collar 156 includes an annular body 162 having a central axial hole 158 sized for operatively receiving and engaging the shaft 102 the shift collar 156 also includes internal splines 160 about the inner surface of the axial hole 158 for engaging corresponding splines 116 on the shaft 102 the shift collar 156 also includes at least one dowel 168 extending from planar side surfaces 164 a first surface and 166 a second surface i e a first.