Scott - I measured the protrusion of the flue, then made a guess about
where in the bowl the cut should be made to fit snugly over it.  A little
grinding and sanding was necessary to get it just right. I wanted the flat
end of the bowl to lay directly over the flue so tightening the bolt would
not unduly flex either surface.

Good luck!

Jonathan

> >
> http://bluehighwayvanagon.blogspot.com/2012/03/westfalia-improvements-part-ii.html
> >
> >
> Jonathan,
> How did you determine the right location to cut that bowl over the flue?
>