Easiest way is to buy a balancing kit at a home center. They only cost a few dollars. The advantage is they have clips that you can easily attach to the paddles. You slide the clip up/down the length of the blades until the wobble is minimized.
Then you take a small weight, which comes with the kit and happens to weigh the same as the clip, and attach it to the back of the blade at the same point where the clip was located.
It's a lot easier and faster than a roll of scotch tape and a few coins...