The wheel may spin on a rear axle (e brake off). If so then you can balance it with just weights.
It will drop the heavy part to the bottom. Add enough weight (opposite to the heavy spot) so that point moves to close to 90 degrees to the left or right, then add weight until the wheel will not stop in the same place when you spin it to check final balance.
You should have to add weight only on one half of the wheel and probably within 120 degrees between the weights. I have found this to work very well if you don't have the capability to spin balance them. If the first (heavier) weight is perfect, then the second(if it needs one) will be exactly 90 degrees from the first. Any wheel with weights opposing each other is not properly balanced. Seen weights added without all weight removed.
regards
Mech
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