Dave, I don't know of any measurements one can take to determine Expanding Action Brackets..only symptoms. Contact Chad Frye at Weber Piano: 800-346-5351 or chad@weberpiano.com Make sure you have the serial# when you call. I don't believe Chad is a full-time employeee, so you will have to be patient with his reply, but he will help you. Good Luck. Phil Bondi(Fl)
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