The Tamiya ones are 0.2mm small than they should be with the amount of teeth they have. Whether they have done this on purpose (chopped the tops of the teeth off to give more 'grime' clearance) or shrinkage, I don't know.
RW are going to send me a 'proper' size one to test fit into my gearbox, and go from there, he should in theory, be machining them on Thursday.
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