Small APC's have the bushings, but the bigger ones have to be reamed.

to straitnickel: You mentioned that your blade tracking is off, which will cause vibration even with a perfectly balanced prop. To fix that, you can sand the back of your hub flat, making sure to get the blade tips the exact same distance to the flat table you're working on. Then you'll need to use a tapered reamer like the thread has talked about to let the hub sit flat. It may not be worth the effort to you to save a $4 prop, but that's likely the issue.