First off, thanks to all of you for your replies. I would like to be able to re-tap it. The clamp assembly encircles the entire post. it is split in the rear, and a bolt squeezes the two sides together. This hole is in the front and is for a bolt which, i can only surmise, helps keep the clamp from sliding and/or spinning around the bronze post. I will post more pics this weekend when i get back to the boat.
Shnool, if i go to a bigger bolt, i will have to tap the clamp assembly as well. I will post a pic soon and you can tell me if the clamp can accept the larger diameter bolt.
Casey999 I don't know what the original bolt material was. The cracked bolt that I removed was stainless steel ( I believe). The current bolt is just there until I pull her at the end of October. I hope it will be clearer when i post more pictures.
Captflood?OtterGreen/TQA: I am probably leaning toward the brazing or JB weld option. If I use the JB Weld, should I wax/oil the bolt so i can extract it after the epoxy cures? This way I have threads to tie into. The rear threads will hold the bolt in place while the epoxy cures around it.....Either that, or find someone to braze. I can drill and tap it myself. Once again thanks for all your suggestions. the same ideas are being suggested from different sources, so I know I am on the right track
and one more newbie question...what is the difference between brazing and soldering???