gorilla glue epoxy! Not nearly as scary as super glue expoxy glue does smell strong but you can get it on your hands without fear. Once cured it is super durable and holds earring backs like no tomorrow.
Lessoned learned from making earrings:
* Not all earring can be easily converted, some times after you take off the clip there are welding bits left behind that can't be removed. You need to be creative and glue the earring post somewhere other than where you had thought you would, making the earring sit differently.
* Now that I see them I should have held out and bought gold toned backs to make the earrings looks more legit but I am impatient and used what I had if you want to do a nicer job do plan ahead.
Overall I am super pleased with my new earrings I have been wearing them out almost everyday since I made them. I don't recommend breaking up a pair of signed Shermans but if you find old clips for $1 and you know you will wear them I say go for it. I think vintage should be worn so if clips back are holding you up, convert them!