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Support to add weight in the center of the Winkle spools (53mm internal diameter) and not have problems with AMS.

edit (18-12): added 2º version with empty interior, so you can add sand, stones, washers, loose nuts...

Interior with 3 holes to accommodate M10 screws with nuts. In this case, using an m10x65mm screw and 7 nuts, we have a weight of 330g (3x110gr) with the metal alone. The total weight with the model and the empty coil is 600g. This weight is ideal for coils with less than 40% capacity, since this way they will always be between a minimum weight of 600g - 1kg, making the AMS work perfectly.