Just for fun, a dealer once demonstrated to me the quality of Bosendorfer casters. He had an Imperial on the floor of his workshop, which had a glass-smooth concrete floor.

He gave the Imperial a slight nudge and off it went like a curling stone on ice. It just moved along at a snails pace. I figured it was getting its momentum from the movement of the planet, like a pendulum. It might have moved all the way to the wall had we not both stood in front of it and stopped it.

That was the day I realized that casters lock for a reason. \:D
Former Piano Industry Professional
Steinway M
Roland Atelier AT90R
All Posts are Snarky Unless Otherwise Noted