ORIGINAL: Mustangman40
That's kind of my thought as well.... When you balance a prop you don't add weight, why would you add to a spinner?
Personally, I don't see any problem adding small weights instead of grinding. More control I guess. Plus if it doesn't work out the first time due to static balancing being not perfect, you can undo.
I always balance the backplate first (there i use a large drill to grind some material in the desired spot).
Then, I ad weight little by little in the middle of the spinner (not at the extremities) to minimize the "counter balance" at the wrong end problem.
I was just asking about the theory of adding weight a 11 & 2 o'clock. anyone knows?