Bearing2Marble Adapter

This adapter is meant to let you replace bearing weights in, for instance, your spinner with marbles (as I happened to have a whole load of those lying around the house). It's made to fit marbles and ball bearings from about 14,5 mm up to 16 mm (though 16 might be a pretty tight squeeze and anything less than 14.5 would fall out).

This should work well with most standard toy marbles, even though they come in pretty irregular sizes and finishes at this scale.

Please note that in order for