я сыпал дробь восьмого номера, 2.25мм диаметром, сверлил дырки 2.5, засыпал через воронку, потом резал резьбу и закручивал винтик, в полости тележек еще просто, заколотил пластиком торцы и с обратной стороны засыпал, и такую же заглушку из пластика, что бы дробь не брякала залил жидким “затекающим” герметиком, можно просто моментом резиновым
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