Quoted from DaveH:
I always thought a shaker was inherently an unbalanced system. Hence, the shake. The weights are intentionally offset. So if you’re saying a gram on one end or the other is the extra weight that will throw the entire system off, I’m crying foul.
They are designed to shake,yes but the weights are equal so that the shaft does not tear apart the motor bearings.
These are just a smaller version of what we use on our dump trailer bodies at work.
Furthermore some shaker weights are offset, some are not. If you have the weights offset the motor spinning will give less vibration but it will last longer. We can usually get 4-5 yrs from the offset weight style motor at work.
The non offset in our clay bodies last about 2.5-3 yrs depending on how long the driver has it on to get the body empty.
So you don't think I'm full of shit, here is a video of a dump vibrator in action.