I made some extrusions on a part, and some don't seem to be part of the part. They have a gap. Other extrusions seem OK, but I made them all the same way, I think. I got the main arc using Convert Entities, so I don't know why there would be a gap? I made the gap disappear using Combine Bodies, but that doesn't seem right, and SW didn't let me do a circular pattern on it until I removed Combined Bodies. It this just a video artifact, or something I did wrong? Also, I noticed for the first time that the Line tool was acting strange sometimes. It seemed to insist on a tangent line? I just kept at it until SW gave up, and let me do what I wanted.