I posted this up in another thread and figured it might be helpful here, so I'm reposting:

I found a way to balance the blades using ordinary household items: 1 paper clip, 2 rubberbands, 2 CD jewel cases, a dictionary, a ruler, felt-tip pen, scotch tape. I based my procedures off of T-Rex Tuning.

I bent/broke off one of the straight pieces from the paper clip and threaded it through the holes on the blades. This was held in place by the rubberbands and wrapped them above and below enough times to hold the blades straight (at the 3 and 9 o'clock positions).

I placed the extended paper clip pieces on the upright CD jewel cases to find the lighter blade.

I placed the ruler inside the upright dictionary and held the ruler perpendicular to the table. Using the ruler, I followed the directions as described in the T-Rex link above to find the center of gravity. I placed enough tape at the appropriate end of the blade to match the center of gravities between the blades.

I then rigged it back up using the paper clip and rubberbands and then balanced their weights with more tape.