<HTML>In a message dated 4/6/2003 10:49:53 AM Central Daylig= ht Time, RNossaman@cox.net writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT= : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Very nice. Are you shaping and = polishing to a specific contour? The point I was trying to make was that you can't accidentally insert a single helix <BR= > thread in any way that it will end up 180° from where it was before it was= taken out without making height changes. Ron N </BLOCKQUOTE> You're absolutely right, I went right by your main point to the notion of re= placement. P</HTML>