Abstract: A mobile observation stand assembly includes a platform that may be in a lowered position for transport and an elevated position for use in a desired location. The assembly includes a base supported by a wheel and axle assembly, with an articulated anterior frame and an articulated posterior frame attached to the base. The posterior and anterior frames each include a basal frame and a principal frame that are jointed by a rollover lock joint that allows for pivotal movement. A leveraging cam is attached to the posterior frame, with the cam supporting the anterior frame during repositioning of the assembly.

Abstract: A centering tool composed of two symmetrical plate members that are slidably connected together. The one member is mounted on one rim flange of a machine with a linear reference edge on the other rim flange. The other member is mounted on the other rim flange with its linear reference edge on the one rim flange. Both plate members have second intersecting edges that define a center of the rim flanges at their juncture.