I got a 64 EBO bass at the Cincinnati Guitar show last Sun. It's in really nice shape for it's age and has been professionly refinished so it looks almost new. All the hardware is there, although the bridge looks like it might not be stock... it has threaded saddles that will adjust string spacing and I'm pretty sure the stock one didn't, but it's defintely made for an EBO or EB3. Serial # is 274XXX (I don't know why everyone X's out the last # but I thought I"d better too). The problem I need help with is that when I restrung it (I used Epiphone .45- .105 with an EBO on the package) I had a stress crack appear from the E tuner to the bottom of the headstock. It wasn't there when I bought the bass. I looked at the headstock when I got it. Is it okay to play the bass? It plays fine, or will it get alot worse if I do. I haven't owned much vintage stuff and anyone that has might be able to help me. You can see the crack under the front of the headstock but it's not an open crack.