Hi Billabong,

re:
> Thank you again. Can you tell me what you did, because I tried the trimmed,
> untrimmed method you told me about a couple of days ago, but it didn't work.

The retrim part was a little finicky, I needed to draw in some lines to use as trim cutters instead of reusing some of the same original edges.

The 2 halves don't seem to quite line up exactly down the centerline, like a mirror axis line maybe was just slightly not axis aligned.

Also I discovered that a quick hack to clear this particular type of trim boundary corruption is to separate into individual surfaces and export to an IGES file and re-import it back again.

- Michael