<HTML><BODY BGCOLOR="#ffffff">That would certainly explain it. &nbs= p;I think it's a heat activated process as well.  I don't know if it's = pin plating or graphite, but it looks like graphite to me.  I assume th= e heat gums it up and causes the center to seize. I work on one where I've replaced probably half the pins in hammers and = whips.  The Samick I tune is about the same age as your Hyundai, and al= so sits in a big picture window where it gets baked every day. Dave Stahl In a message dated 1/1/05 11:31:17 PM Pacific Standard Time, brispiano@o= ptushome.com.au writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-= LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Terry, Hyundai's were made by Samick. Kerry Cooper <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-= LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">----- Original Message ----= - From: <A HREF="mailto:terry@farrellpiano.com">Terry</A> To: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> Sent: Sunday, January 02, 2005 2:39 AM Subject: Hyundai Action Centers Went to service a 5-year-old (about) Hyundai small grand the other day. = Many action centers are very sluggish (to the point of not functioning) on t= he rep levers, jacks and back-action flanges (none of the hammer or wippen f= langes seem to be affected). Is anyone familiar with any known problem with = action centers on these pianos? (I'm thinking of something like the known ce= nter pin plating problem on some Samicks.) Just trying to find out if any kn= own problem like this exists before I dig into it. FWIW, the (black) piano has been sitting in direct sunlight (arrrgggg= gg!) for several years. The side of it was so hot I could not keep my hand o= n it! They indicated they will be moving it to the other side of the room be= fore I return..... Terry Farrell </BLOCKQUOTE> </BLOCKQUOTE> </HTML>