Bubble Ring!
I used some Quarter Round Plastic Strip to make molding around the Bubble Top. First I marked the shape of the Bubble Top. Then I wrapped the Plastic Strip around a small bottle a few times until the Strip held the Round Shape. Then I glued it about an inch at a time, along the line, using Zap-A-Gap Glue.
Here it is in place. Later I sanded top of the Quarter Round Strip down flat.
More Coming...