> You can buy caster cups from most supply houses, or from Jim Grebe. Just > screw the caster cups into the floor, and put the piano legs in the cups. Not! Speaking as someone who has been on large and smaller ships in heavy weather, I can attest that the last thing you want to worry about in that moment is a 750 lb grand piano which has jumped over the rim of the caster cups and is now creating havoc in the main salon, rolling to and fro, overturning tables, smashing into walls and crushing furniture, hopefully vacated furniture... If someone believes that a 1/4' or 3/8" lip on a caster cup provides an adequate guarantee that the piano will stay put, I suggest that they have never been on a real ship when it encounters real weather, as will be unavoidable from time to time. The operative words are "safety margin". For this purpose, the cup should be closer to 3/4 or 1" deep. Better yet: remove the caster and bolt a square cup to the floor which snuggly fits the piano's legs Jurgen Goering
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