I’m getting empty space where two objects I’ve drawn overlap. I want them to join into one solid object.

I’m trying to build a bell.

There are two rings interlooped like links in a chain. Those are swept boss bases. The clacker - the object interacting with one ring is a cad image I dropped in and surface revolved, mirrored and surface knitted.

The main portion of the bell was built the same way as the clacker and it’s not having any problems. Why is this happening and how do I attach my SW file so you can check it out?