ORIGINAL: RCKen
Use a prop reamer to enlarge the holes in a prop. The proplem with using a drill to enlarge the hole it's too easy for the bit to wander as the bit drills out the hole which will result in the hole being off center, which will throw the entire prop out of balance. By using the reamer to enlarge the hole it will stay centered and keep the prop balanced. You can possibly use a drill if you can use a drill press and firmly secure the prop so that it can't move as the hole is drilled out. But if you don't have a drill press use the reamer.
Ken
Sounds like Ken has used my drill press before!!
Talk about junk!! I have a couple of reamers of both metric and sae, there is always one in my flight box. My prop box has a lot of different makes but APC has won out on my glow engines. In wood props I started using Xoars and don't even bother with any of the cheaper wood props.