I have an older 6 3/4 ft Horrocks & Ibbotson Queen Elizabeth Power Glas rod that has a broken top. I repaired it a long time ago with some stainless wire. I've decided to refinish the rod as the wrappings are coming undone and the thread is rotten. I will use the existing guides but need a tip top. How do I know what size to buy? Also, Anyone know what weight that rod is? Thanks for your help. Jim