Well, I just finished my intermediate bike repair class and decided to true up the rear wheel on my Giant OCR2. After a frustrating hour I've gone from having a wheel with a tiny wobble to having one that's so whopper-jawed that it won't even spin between the brake pads. I've also successfully rounded several nipples to the point that I can't even get a set of pliers to turn them.
1. Is there any chance that the nipples on this bike are backwards threaded or am I just cognitively challenged enough that I'm turning them the wrong way?
2. Can I buy new nipples and if so, where?
3. Should I give up and take it back to the LBS and have them rebuild the wheel or take another stab at it after I've cooled my heels and head for a while?