<HTML><FONT FACE=arial,helvetica><HTML><FONT COLOR="#000000" FACE="Gen= eva" FAMILY="SANSSERIF" SIZE="2">Ron<BR> <BR> Thanks for the indepth reply.  I have a much better understanding of t= he phenomenon of tuning instability near the plate struts.<BR> <BR> This list is a great resource.<BR> <BR> Tom Sivak</FONT><FONT COLOR="#000000" FACE="Geneva" FAMILY="SANSSERIF"= SIZE="2"></FONT></HTML>