>   I think it can be made more easily and efficiently:

For some boost you could get rid of the planes, even though they are more
_elegant_... Try this in place of the planes inside the macro:

#local H = 2*MinRad;
#local L = H +MajRad;
box { <0, H, L>, <L, -H, -L> }
box { <0, H, L>, <-L, -H, -L> rotate -y*Ang }

 - Nikodemus

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