Originally Posted by
CafeenMan
A magnetic balancer has close to zero drag so if the prop moves very, very slowly it is as close to being balanced as it can be. If the Dubro shows that same prop as being balanced it's probably just because the Dubro has a lot more drag with the wheels. I have a magnetic balancer that has the same trait as the Top Flite and I trust it a lot. I've never used the Top Flite though but it sounds like the same behavior as mine. If it is then it's nothing to be alarmed by.
I don't try to too hard to get my props to stay perfectly still on the magnetic balancer. If there are very subtle, slow intermittent movements, I figure something such as air currents in the room could be causing the movement. If the prop is close to staying still, it's probably balanced.
That said, I wish I bought the DuBro balancer instead, since it can balance spinners that do not have a hold in the front.