Here's how I've always done it. Lift one end, get one dolly under the piano. Repeat on other end. Place dollies as far outboard as possible. Lag them both into the back of the piano. Stand piano on end. Bolt or screw dollies to the bottom board, as close to the front as is feasible. Remove existing casters. Set piano back down. Give threshold ramp jump lecture. Submit invoice. I haven't screwed the dolly to the toe yet, but it's an excellent suggestion if it's doable. There's usually some minor repair, like reattaching the side of the piano, that prompted the compelling need for the dolly in the first place. But that's another series of problems. Ron N
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