When in the RAF a part of my job was to fit very heavy aircraft engines. At times the wheels on the engine stands would seize or “flat-spot” and make it impossible to push the very heavy engine into position. A colleague came up with the idea of placing two polythene bags or sheets on the ground under the defective wheel. This then made it possible to push the engine into position as the two polythene sheets just slid over each other. With each wheel having its own polythene sheeting it was possible to push a 10 ton engine with one hand! I later used this method to single handedly move a 2 ton pottery kiln across a tiled floor. Nobody could workout how it was done.