A piano, even a small upright, is awfully heavy, but putting it on its back is sometimes necessary.
Need to install new rubber casters to replace the old metal ones that are seized and would ruin the floor ?
With the right tool, one man can manage easily.
In this case, the goal was to install a permanent dolly so the piano could be moved around the room.
My thanks to Steve Lecky, Dawson College, Feb. 2011