https://www.renderosity.com/mod/bcs/index.php?ViewProduct=108124  

The model is included in Collada and OBJ format. Collada is supported by all modern rendering programs. In Collada all the groupings and turning axis are preserved on their places, so I recommend to use the Collada file if your program supports it. In OBJ format there are no groupings and all axis are in 0/0/0. In OBJ you have to put all the axis in the middle of the turning points by yourself. For OBJ there are two additional files for the ramps. One for the closed ramp and one for the open ramp. I did it so because in Poser you can import the files separately. For all other user who import the Collada file, please switch on or off the desired parts.