I lost a tip of a rod on a car door a couple years ago (not practicing, although I could use the practice). And as others have said, put on a new guide/rod tip which you can get for a couple bucks, and you got yourself a slightly shorter and more stout rod ready to go!
my vendetta had one eyelet that was cracking and about to fall off and i went to basspro looking for some type of apoxy to hold it in place and i had help finding flexement in the fly department, i have been putting generoous coats of it not only on the broken eyelet but on others to prevent that issue from reoccuring. but once the glue dries it will flex with your rod, so it wont crack again
What kind of rod is it? I know I sent a G.Loomis back that I bought from a friend and got a brand new one for a small fee ($50.00 I think) They have no way of monitoring who is the original owner.