Michael's (Porter Square) and AC Moore (Assembly Row) stores sell findings. I know that AC Moore also has classes, wouldn't be surprised if Michaels' did too. I'm not recommending you go to a class, but you might be able to go there and find out the name of the jewelry class instructor. If you do, and offer to give them $5 they'd likely be able to fix it for you. Personally, I can likely do the fix for you too, but I'm no pro. I do have the correct tools however, and can likely be able to fix it to a functional state.