Hi!
I use a Dremel and tungstencarbide cutters from Micromark when I trim my Tru Turn spinners...but forget the Great Planes (Top Flite)magnetic balancer if you want to balance small 1,3/4"-3"spinners...That balancer is going to drive you crasy as it is not exact enough......the spinner just turns whatever you do to it.
So.... I'm just careful how much I cut away and don't bother wirth balancing.

Regards!
Jan K