How to cap this hole / finish this BREP?

Dear all,

I’m trying to close this BREP, but either with capholes, or using a boundary surface to join won’t work. (28.3 KB)

Thank you in advance!

trying to join just the two sweeps, brep edges shows the mid-edge already has a joining problem (that mid-edge should not be naked after joining, right?)

so it’s time for the forsaken method of lowering the Rhino tolerance :slight_smile:

Awesome! Thanks for the quick help!