Prop balancer ?
A 13" is the biggest prop I had balanced with the Top Flight, before trying to balance a Byron fan blade, the Byron pulled the shaft off the balancer. The Dubro true spin will balance anything I have tried, up to 24" prop, 6" ducted fan blade so far. Plus the advantage of dynamic balancing. It only cost $8 more than the top flight, reminds me of the old saying, "buy cheap, buy twice". Wish someone had told me this before I bought the $20 Top Flight.