Wow! that's a huge hole! I'd probably go back to 5micron grinding on this one and then repolish with much shorter strokes for polishing. Any attempt with this would probably take a lot longer to do with just polishing than to go back to grinding. Bob May My new web space address is http://webu.wigloo.com/bobmay/ or http://nav.to/bobmay and my new email address is bobmay@nethere.com Bob May