I don't know about the Dubro balancer, but I used the Finger Balancer between 2 drink glasses. Do a search as there is a great website that shows how to balance props. A 3 bladed prop should balance in any position. Beware, the 2 Evo props that I have were extremely out of balance. I had to forget sanding with sandpaper and grind tips with a Dremel. The plane flies much better now.

I got the link to a good tutorial on balancing props from a link on RCU. I'm on another computer at the moment and don't have the link here. Sorry.