Hi:let's use Martin's file:
select yellow loop and union
on top wiew draw two circles R=2
sweep:two circles as sections and yellow curve as rail
trim your solid using red sweep object
select both loop edges and blend using G2-bulge=1
to avoid wrinkled blend,select PLANAR SECTION option on the Blend window
you'll have a straight line instead of curved wrinkled seam
hope is smooth enough for you
say lot of thanks to Michael to make this fantastic software,not to me....
file attached: M
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