Patiently waiting for the other shoe to drop.
   Why is it we need to work on the inside of a sphere? What sphere?
    What element is it made of, and why?
  How big is it?
How big of an entry hole is allowed?

  Or can it simply be turned in 1/2's and put together?
If you can open it up, then a scraper ground out for the occasion and 
used on the lathe is going to be fastest.
    yours scott



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    Scott Grandstaff
    Box 409 Happy Camp, Ca  96039
    scottg@s...
    http://www.snowcrest.net/kitty/sgrandstaff/
    http://www.snowcrest.net/kitty/hpages/index.html