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For use with FRB12 Inside Bearing Slate Wagons.
The bore is 4mm. This can be directly fitted to Slater's wheelsets without a bush, or you can use 3mm bore 4mm OD brass top hat bushes (4mm scale loco mainframe bushes) and a new 3mm axle for your Slater's Wheels.
It is suggested that M1 or 14BA stud is glued into the wagon body and the bearings fixed in place with nuts.