Guess who makes sells caster cups in groups of 2 or 4 for that very reason? James James Grebe Est. 1962 Piano Tuner-Technician Creator of Custom Caster Cups Creator of fine Writing Instruments www.grebepiano.com 1526 Raspberry Lane Arnold, MO 63010 (314) 608-4137 Become what you believe ----- Original Message ----- From: "Jim Busby" <jim_busby at byu.edu> To: <pianotech at ptg.org> Sent: Thursday, August 20, 2009 9:27 AM Subject: Re: [pianotech] double-striking hammers on Chinese uprights Scott, The Mannino post is what I was referring to that works on almost all pianos. The balance problem I referred to has happened on a few lately and the titling/"turbocharging" worked when all the other stuff didn't. I forgot to add one more thing. If the piano is literally tilted toward the wall (I've seen this on these bobblers too) adding caster cups to the rear casters helps. Uprights and their springs still have to deal with gravity. Jim=
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