Originally posted by Acoma
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I hope you were wearing a mask of some sort for all that grinding.
I am attaching two possible solutions. The first will work with the grinding of course six that you did. Check the measurements I have included from top inside edge of 6 to pivot at 22.25", direct to floor (not to pivot) of 14.3" and from center of floor to inside face of c1 at 21" and if they agree with actuals, a gap of .45" between courses will get you to 20". Make sure I have represented your grind on c6 correctly. If any of the measurements outlined above don't agree with real world, tell me which one and I will fire off new drawings.
Sorry for the second because it would require the removal of course 6 but provides for a better transition between courses resulting in a smoother inner dome. Once C6 is removed the gap would be .58" between courses.
Hope this helps.
Jim
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