213 note that in fig6 b a major part 226 of weldment 225 can be removed because of the weight distribution in the dual machine with the joined machine 39 s center of gravity operating further away from the user the machine 39 s feet can be moved to a point in front of f rather then behind f without fear of tipping forward weldment portion 226 outboard of feet then serves no anti torque function and can be eliminated or used for another purpose at reduced strength fig7 a depicts the single station stairclimber 39 s major structural component it is the base weldment 225 identified in fig6 a the weldment 39 s major components are tubes 236 and 237 joined together by front angle 223 and rear angle 227 which support channels 238 and 239 to which upstanding longitudinally running shaft plates 228 229 230 and 231 are attached arm 210 rotates around shaft 215 and are hung from support 240 by hydraulic cylinders 241 as shown in fig7 b the torque resulting from the user applying weight and accelerating force at the end of the arm 210 results in a torque that pulls support 240 down and lifts shaft 215 up this torque is countermanded first by the shaft plates 228 231 and channels 238 and 239 then by the front angle 223 and rear angle 227 and through their attachment to tubes 236 and 237 to the ground the weldment also provides anchoring posts 232 233 234 235 for attaching the rails fig7 b is the dual station machine base weldment to be noted is that a second support 240 39 is the one additional part required in the dual station weldment one additional hole 243 is required in the shaft plates.