I'm with Denny on this one. In the mid 1950's, when tubless tires were fairly new on the market, the sealing material inside the casing would sometimes shed (apparently), and form beads or marbles of various sizes inside the tire. When attempting to balance a wheel/tire with a spin-balancer, the machine would show a different weight location, and often a different weight amount after each spin.
I have never seen this problem revealed with a bubble balancer (off-car balancer), because when the bubble is centered after afixing the weight(s) and the wheel/tire returned to the car, any recurring unbalance would not be noticed until the vehicle is driven again. Then, back to the shop...
With either balancer, spin- or bubble-balancer, attaching a large amount of weight to one side of the wheel might correct a static unbalance (circumferential unbalance), but would/could introduce dynamic unbalance (side-to-side unbalance), which may not be noticed until the vehicle is driven again and the necessary conditions reached.
Maybe the subject beads work to correct dymanic unbalance, but I'm skeptical that they would work for static unbalance.
Harvester
