Balance plates. Who's right, Who's wrong

Professor Fate said

Well, if you're going to have an entire rotating assembly balanced, you won't need adapter weights...
This is to benefit the guy who just wants to slap a 360 in front of a 904 (or whatever) and go.

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I know. From the sound of it, he already had it balanced without the weight. Maybe I misread it. If it was mine, I'd have it all balanced to match the external balancer along with whichever of the plates I chose. That'd be the most economical way. Otherwise, it's tons of mallory metal to make it a neutral balanced motor.