RE:Fly falling apart, what can I use/do?
I've used fabri-tac, zap-a-gap, epoxy, and sof-tex all with great success. I have also used clear fingernail polish with not as great success. BTW clear fingernail polish painted on your watch face saves it from scratches. When the finger nail polish gets scratched you either remove the old and coat again or just add another coat.
As Juro stated, I bet your biggest culprit in the falling apart fly is the back-cast.